A7 will support FBX file format What's the advantage ? As far as I know FBX is the native file format of the MotionBuilder animation package. I dont think it is popular in the Indie comunity ,being quite expensive Probabli the XSI file format would be of more use thanks to the economic XSI foundation package
By the way , I do hope that A7 will support bone animation with more than one vertex per bone This is really a a main issue, please confirm
FBX is very popular and used in many good 3D software like Maya, 3D Studio Max, ... It's the first standard with the possibility to export and import most content like mesh, camera, lights, vertex colors, bones and more.
Not only the big 3D Software are using FBX, also some other for lower budegt. Here is a 3D Software (only texturemapping) for ~$50 with FBX Support: http://www.unwrap3d.com/news.aspx And here another (free?) 3D Software supporting FBX: http://www.wings3d.com/
fbx support was one big reason for me to buy Gamestudio! I use Cinema4D to model etc., by the way (which exports to fbx and is quite affordable (compared to 3DSMax and Maya etc., too)