Many of you have already mentioned it, but the new forms of the Tree of Life are now available in the Cataclysm Beta. In this little video that comes from the hand of WoW Insider, you can see how they are in nature. As you mentioned, the tree has the Orc movement animations. Remember that the form this is now a Cooldown Time.
If you are wondering how to get the different colors, I have bad news for you: they are colored by race.
- Night Elves: Purple Form
- Worgen: Dark brown form
- Tauren: Brown and green form
- Trolls: Light brown form
Personally, I don't like it very much, do you?