In the feral talent tree there isn't going to be a new form.  However, feral druids will be happy to know we get a fear resisting ability called Berserk.  Of course, none of the talent tree's that have been leaked are going to stay exactly like that but a lot of them will.  http://urlshort.com/wotlk/site Go to that site if you wish to see some of the talents.  Fury warriors are going to be able to dual wield 2 handed weapons...Demonology locks will be able to transform into a demon.  Balance druids get an AoE. Some of the talents aren't complete of course but you can get a nice idea of what spec to go as a DK also.  Ima think ima go Unholy.:P