Great news, a few new leaks about the new expansion was revealed!

-2 new battlegrounds
-New battleground "skins" (winter arathi highlands, spring alterac valley, etc)
-2 new arena maps (one set in the twisting nether)
-PvP gear tier sets completely different art than raid / dungeon tier sets
-Dungeon tier sets reintroduced to the game
-New Race / Class combinations (Gnome Paladin rumored to be in there)
-More dungeons than previously announced at launch, more added in each major patch
-Scenarios are making a return, Heroic scenarios will also come back
-Max level Daily quests in every zone. Doing dailies in each zone will progress the story of the zone even further than completing the zone during the level up experience. Daily quests will be tied to specific factions with faction specific toys and gear
-Valor is here to stay, will be linked with upgrading gear as well as buying specific gear from vendors, including half of each major tier set
-LFR removed (no queue-up raids anymore! yay!), Normal to take its place, Normal slightly lower tuned.
-Group builder tool expanded
-New world events (random events that take place at random times, think GW2 zone events that when you participate you get ranked and scored, and you get loot according to how well you did / participated in the event, which means no afk / bad gameplay or no / little loot)
-Sargeras will make an appearance in this expansion, although we wont fight him (precursor to next expansion?)
-3 Major patches planned for this expansion, with multiple raids / dungeons each patch
-Dalaran will have a new area built by the mages of the kirin tor, with mini games and tons of lore connected quests that send you to parts of the islands, and into outland to recover past artifacts
-Blizzcon will feature playable starting zones in the new expansion continent, and will allow blizzcon attendees to play the demon hunter zone
-Illidian will play an integral role in helping you kill the big bad guy of the expansion
-Darkmoon fair is extending its stay! Fair goers will be able to participate in the fun for 2 weeks per month instead of just 1
-2 world bosses will be available at launch, but they will not be easy pushovers. They will take coordinated guilds to kill.
-Flying achievement will be able to be completed by the second major patch of the expansion. (7.2)
-Several mini games can be found out in the open world. (Plants vs Zombies type games) Doing these mini games and getting high ranks will give toys, pets, mounts and cosmetic rewards

And thats all I know! Cant give source for obvious reasons! Enjoy! Feel free to believe or dont believe, but this is a REAL LEAK.

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