Client side Tree Widget is refactored with a cleaner dom structure and along the way we’ve added animation to display during expand-collapse. The feature is enabled by setting animate attribute to true.
As a result of the major refactor on client side tree, we’ll be able to add upcoming features like dragdrop, inline editing much more easier in future releases.
See PrimeFaces Labs for a live demo.

Nice feature,
It miss only to be able to navigate in the tree by keyboard.
I think its a must have feature in a tree component.
You are the best …
Omar is right, keyboard is good option. Expanding trees with plus and minus or toggle with spacebar.
Great feature. When you guys going to release 3.4 final?
BTW – a silly question which theme do you use?
nice…looking forward for dragdrop