The World of Warcraft pact 5.0.4 has just been released, and it is expected to bring a host of new features to arguably Blizzard's most widely perceived RPG. The patch notes for the 5.0.4 update includes everything from class changes to the addition of cross real zones.

Below is the full list of what players can expect when installing the update:

New Talent System: This has been revamped to accommodate unique core ability and specialization choices in gameplay.

Glyphs Updates. Glyphs have also been redesigned to be more specialized, giving players even more engaging customization choices.

Class Changes. Alterations to character classes have been made, which include a variety of new spells and abilities.

Area of Effect (AEO) Looting. This, of course, makes looting even easier for players.

Account-wide Mounts, Pets and Achievements. Gamers now have access to nearly all of these entities across their characters under one, single Battle.net account. It is important to remember that this only applies to account-bound pets. For example, users would not be able to purchase an Argent Pony Bridle in one toon and allow their other toons to summon Argent Squire with the pony.

Theramore's Fall Scenario. The first two Scenarios, which include one for Horde and one for Alliance, will be available for players just before launch.

-   Cross-Realm Zones. This is a new technology which allows players to meet up and group with other sections of the game universe that are under populated.

BattleTag Support. This is a permanent account-wide nickname that acts as a player's identity when staying connected to Battle.net's social features.

With the new patch update also comes some extra digs, which is the only fresh archeological change to come before the "Mists of Pandaria" expansion is released. For now, players will have to settle with the extra digs per site arriving in patch 5.0.4.

The release date for "Mists of Pandaria" comes on Sept. 25, and predictions indicate that this could break 3.5 million sales becoming the fastest selling PC game ever. This would follow in the footsteps of the MMORPG's previous expansions which have also yielded massive first-day sales.

When "World of Warcraft: Burning Crusades" launched in 2007, it sold 2.4 million copies in its first 24 hours. "Wrath of the Lich King" garnered even more impressive sales in 2008 when sales amounted to 2.8 million on day one. The most recent expansion, "Cataclysm," had shipped 3.3 million copies when it was released in 2010.

This past May, the highly anticipated "Diablo 3" was released which completely shattered these records. The third installment in Blizzard's dungeon-crawler phenomenon quickly became the fastest selling video game ever, resulting in 3.5 million sales.

Will "Mists of Pandaria" set another record-shattering launch sales mark? Players will have to wait until the end of next month to find out.