So, the beta server got the new tree form graphic. I’m pretty sure you’ll be a ble to see it from space. You may have a hard time fitting through some doors (except that the branches don’t seem to clip the top of the door frame, so that’s good).
MMO-champion has a chart to see each of the 4 tree colors (which I believe match up to each of the 4 races). From testing them on beta: my Night Elf’s form is the purple one, my worgen’s form is the dark brown one (I was able to race change one of my druid copies into a worgen). That leaves trolls as probably the brighter orange one, and the tauren as green leaves (I don’t have horde druids high enough to test graphics for troll or tauren). However, don’t hold me to this, as I could be wrong – and it is highly subject to change, since this is the first time we’re seeing a new graphic in beta.
The new tree form is MUCH larger than the old tree form graphic. This may end up even being a problem in PvP if it prevents you from getting through doors or makes you too obvious of a target. If you can’t stand the new tree form graphic, they did put in a glyph in beta that would let you switch it back to the old “treant” form (though I can’t learn the glyph to test it out).
My weapons were showing up in the new form (I could see the staff on my NE and a mace on my worgen).
The new tree form has casting animations, and can sit. New tree does not yet have a dance animation, as far as I can tell. Dancing usually comes later in the design process.
UPDATE: Adding troll pictures (beta gave me a faction change for one of them, so I went troll on that character). It is the light orange color. The last 2 troll pictures (the light orange ones) have casting animations.
Click on each picture to see the full sized effect.