Flash 10 documentation has been posted and linked to by Ryan Stewart and Trevor McCauley(senocular).
This is some great bedtime reading you can find out about all the great 3D support in Flash 10, dynamic sound generation, Drawing API in Flash 10, and the very exciting Local File Acces in Flash 10, etc…
I haven’t gotten to the part about bones and kinematics yet. But I will let you know when I do.
Currently it is a zip file with all the docs.
Get the Flash 10 documentation here.
Happy Flashing
Curtis J. Morley