The person who posted this screenshot said it was from the WotLK beta forums, but I can't double check that right now. Anyways, it looks like balance druids get a new pet bar for the treants.
http://img379.imageshack.us/img379/250/wowscrnshot072408005635mb3.jpg
*edited out my 'I'm too sleepy, but I'll post anyways' mistake.
Edited, Jul 24th 2008 7:40pm by Similyn