So, since last post:
* Armatures export has been finished.
* Export of baked animation (for both objects and bones loc/rot/scale) has been added, including current scene animation, strips from NLA and ‘All Actions’ compatible with exported objects.
* Export of curves/metas/text/etc. as meshes has been added.
* Export of dupli objects/groups has been added.
We are more and more close to a complete FBX 7.4 binary exporter for 2.71 release! Yet, more testing is always much welcomed. 😉
There was some work on the importer side too, fixing some issues, extending some existing features, like e.g. a new option to use FBX data for up/front axes and scale, instead of specifying those manually. And a first “armature import” feature was implemented as well (in a separated branch currently, fbx_io_development).
Note that in addition to Unity, which greatly supported FBX export work with their donation to the Blender Foundation, people from Unreal Engine also started showing some interest for Blender FBX support lately – gamedev community is very active on this topic! 😀