None of the information below has been officialy announced by Blizzard, this is only a compilation of information gathered from reliable sources. Just keep in mind that it takes a LOT to make me post something on the front page and I'm definitely not speculating here.
Here's the exciting part, if it's true:
The expansion doesn't have any new class. Instead, Blizzard will offer more race and classes combinations to players, some of them have been datamined on the 3.2.2 Test Realms.
* Human Hunter
* Orc Mage
* Night Elf Mage
* Dwarf Mage
* Blood Elf Warrior
* Dwarf Shaman
* Undead Hunter
* Tauren Paladin
* Tauren Priest
* Gnome Priest
* Troll Druid
Troll druids? Or Blizzard trolling us?
I don't think I would swap to a troll, I like my Tauren, but it would be great for us to get a couple more races as druids.
Then again, if this was our Dire form, I think I would be tempted..
I think I'll be taking this with a grain of salt - MMO say they have reliable sources, but here's the part that made me a little doubtful:
Flying in Azeroth
Part of the redesign of the Eastern Kingdoms and Kalimdor is the introduction of flying to the two continents, allowing access to many new areas and quicker travelling across the large continents.
I could be wrong, but I find this very hard to believe. Blizzard have always said this would be a mammoth effort, with a lot of recoding to do, and they didn't want to put that much effort into revamping old content (they prefer to spend time and money on new and exciting content). Edit: If the follow-up info that MMO posted is true (about a lot of 80-85 stuff happening in the old world), then it would make sense to allow flying, I suppose..
So.. I'm not sure. As Matticus said recently, these news sites don't post "news" flippantly, they have reputations (and therefore, revenue) to preserve. But Blizzard have always been adamant that flying in Azeroth would be time and effort better spent on developing new content.
As usual, I'm taking the stance of, "I'll believe it when I see it."
Besides, we all know that Undead cannot play hunters.
Some new druid races would be really great (without mangling the lore, if possible). If the above is true, I can only assume they haven't "found" the second Alliance druid race yet - otherwise it might be a bit unfair. Although I love my Tauren and doubt I would reroll (other than for fun - hey, a 6th druid might be good for a laugh), it would be nice to have a choice.