patch notes

Cataclysm Systems PatchWorld of Warcraft: Cataclysm will be in stores on December 7, 2010 and the time has come to prep for the official launch by implementing its first major patch. Players can experience many major game and user interface systems updates in the first official patch for the upcoming third expansion, patch 4.0.1.

editGeneralCataclysm Launcher Update
The new Cataclysm Launcher allows you to stream game data while you play. This will reduce the time you spend downloading, installing, and patching World of Warcraft. We'd like to get your feedback on the toolset and gameplay experience. Please head to the forums here for additional information.
Reforging
Players can now visit special Reforging NPCs in capital cities located near Enchanting trainers. 40% of any one secondary stat on an item can be can be allocated to add a new secondary stat to the item. The stat being added cannot already exist on the item. An item cannot have more than one reforged stat at a time, though the Reforging of an item can be undone and changed.
editDungeons and RaidsFlexible Raid Lock System
Icecrown Citadel and Ruby Sanctum now use the new Flexible Raid Lock system. This system provides the opportunity for a character to defeat each raid zone’s encounters once a week. A character may now complete the encounters during the week with different raids of either 10 or 25 players.
Learn more about this feature by visiting our official forums here: http://forums.wow-europe.com/thread.html?topicId=14713237976&sid=1
Icecrown Citadel
The Chill of the Throne effect has been removed.
editCurrencyPvE Currency Changes
All [Emblems of Frost] and [Emblems of Triumph] have been converted to new Justice Points.
Any dungeon or raid which awarded these emblems will reward Justice Points instead. Anything below Emblems of Triumph, including badges from The Burning Crusade dungeon and raid content, have been converted into gold and sent to players via the in-game mail system.
Any bosses players defeat that are level-appropriate to them award Justice Points.
All items that previously cost emblems or badges of any type now cost Justice Points.
Higher-tier Valor Points will be awarded to players who kill dungeon and raid bosses in the latest tier of PvE content after the launch of Cataclysm.
PvP Currency Changes
All Arena Points, Honor Points, Battleground Marks of Honor, [Stone Keeper's Shard]s, [Venture Coin]s, and [Spirit Shard]s have been converted into new Honor Points.
Honor Points will be awarded instead of these currencies, with the exception of Arena Points.
Higher-tier Conquest Points will be awarded to players competing in each of the latest Arena or Rated Battleground seasons after the launch of Cataclysm.
For more information on the changes to the currencies and conversion rates for each type, please visit our Cataclysm forum: http://forums.wow-europe.com/thread.html?topicId=14574620792&sid=1
editClasses: GeneralMany class talents, spells, and abilities have been overhauled, added, or removed.
All spell and ability tooltips will now display damage averages rather than minimum and maximum damage potential. This feature is on by default but can be changed via the Display settings under User Interface options.
Ammo has been removed from the game.
The character levels at which classes gain new spells and abilities have changed.
Many item and class stats have been changed or removed.
Mastery rating has been added as a new stat which provides unique benefits for characters based on class and talent specialization. Mastery rating does not currently exist on items in the game, however, Reforging can be used to add Mastery rating as a secondary stat to existing items.
Rage has been normalized.
Spells and abilities no longer have multiple ranks and now scale with character level.
Talent trees have been altered. All player talent specializations have been reset, allowing for free re-specialization.
Each specialization has been reduced to a 31-point talent tree.
Players will now get a total of 41 talent points to spend.
Players will be asked to choose a specialization at level 10. Doing so will result in the unlocking of a spell or ability unique to that specialization, as well as one or more passive bonuses.
Once a talent specialization has been chosen, players may only place points in the primary tree until at least 31 points have been spent there.
The initial announcement regarding these talent tree changes can be found on our Cataclysm forum.
Death KnightsA dedicated tanking tree (Blood) has been implemented.
The effects of [Blood Presence] and [Frost Presence] have been exchanged.
The way in which runes recharge has changed.
DruidsA new [Eclipse] mechanic has been added for druids.
HuntersFive pets can now be stored with the hunter at all times. Any one of these five pets can be summoned via the [Call Pet] ability.
Focus has replaced mana as a new resource.
Hunters now start with a pet at level 1.
The Stable will now store 20 pets. If a pet is moved into the Stable, its talents are wiped.
MagesThere is now a new spell fly-out UI feature for mage portals. Clicking on the Teleport or Portal buttons will expand the list of choices available.
PaladinsPaladins now have a new resource bar.
WarlocksThere is now a new spell fly-out UI feature for warlock pets. Clicking on this single button will open up the list of available pets to summon.
[Soul Shard]s have been removed from the game as items. Instead, they now exist as a resource system necessary for using, or altering the mechanics of certain spells.
editItemsResilience no longer reduces the chance a player will be critically hit by an opponent.
Durability: cloth, leather, and mail now have as many points of durability as plate, making the repair cost on death much closer to equal for all classes.
editProfessionsThe glyph system has been updated to now feature three different types of glyphs. Many class glyphs have been added, altered, or moved to different glyph types.
editUser InterfaceSpell Alerts have been added to notify players when procs on select spells and abilities occur. A visual notification will display around the character and the activated ability will be highlighted on the action bar.
The Arena Teams pane has been improved.
The Character pane has been redesigned. Character stats can now be shown or hidden via the Show All Details/Hide All Details button on the bottom left. When shown, all character stats will be visible in a window to the right of the pane. Stat sections can be reorganized by clicking and dragging them up or down the pane.
The Professions panes now have more filtering and search functionality, as well as buttons to easily link recipes in the chat frame.
A Professions screen has been added to the Spellbook to better display the details of a character's primary and secondary professions.
Many of the yellow System Messages that would display in the chat frame when leveling up have been removed.
New text animations now alert players as they level up, also providing information on when new talents, spells and abilities are available.
Professions and Class Trainers windows have been altered to more clearly display available and upcoming purchases.
New Raid frames are now. They can also be used in place of the standard 5-player party interface via the User Interface options.
The Spellbook interface has been improved for greater ease-of-use and visual appeal.
For additional notes on Lua and XML changes please visit the UI & Macros forum.
editGraphicsImproved water and lava rendering system (Video Options - Liquid Detail on the Graphics Panel)
Dynamic Sunshafts effect (Video Options - Sunshafts on the Graphics Panel)
Multi-monitor support (Video Options - Monitor on the Graphics Panel)
OpenGL Hardware Cursor support for Windows (Video Options - Hardware Cursor on the Advanced Panel)
Experimental support for DX11 (enabled by passing ‘-d3d11’ on the command line or adding SET gxApi "d3d11" to the Config.W