There’s an extensive list of WotLK patch notes here. Lots of info on what sort of tweaks might happen to your favorite class(es.)
Of course, since this is the beta test everything will probably change between now and the release date.
So look at it as what they’re playng with now, not what the final version will be.
I so so SO can not wait till Wotlk is released, I will be glad to see you there. Feel free to message me or whatever.
-Visin
http://www.azerothnow.com