Here are the details http://www.eurogamer.net/article.php?article_id=94707
Not sure if anyone is reading my blog at all but if you are head on over to these sites and read up.
I am glad they are adding two classes.. its more than wow did with their first expansion. I am also glad that fishing is going to be added soon and they are going to work on mob AI to be environmentally conscious. Lots of other goodies to be announced shortly I'm sure.