Viewer Changes
The mesh upload interface has been revised in the Mesh Project Viewer and the upload reworked. One can get the latest Second Life Mesh Project Viewer and check it out. I think the layout is much nicer. (Also this link should always point you to the latest Mesh Viewer.)
This version is likely the user interface that we will have at Mesh rollout.

Bones
Lots of people want working fingers, which requires the addition of more bones to the avie. No word if that is going to happen. I personally have my doubts, but may be down the road.
Custom Animated Skeletons
Currently the only usable skeleton in SL is the avie’s. But, having other skeletons that could be animated would make things like dragons, horses, and dogs much easier to animate. Whatever, they will not be part of the initial rollout of mesh. However Prep Linden is working with them.

