The animation and skeleton format for Heroes 5 is GR2. First, you need adequate plugins for importing and exporting it. Regardless of the version or program, and then we can talk about it. By the way, I'm currently working on a mockup using a Kinect from the Xbox 360. In my opinion, the results are decent. Perhaps this could be used to create good animations for Heroes 5, if only there was a well-established system for importing animations into the game.
The Blitzkrieg plugin includes a file called granny_maya6_0.mll - this is a Granny export for Maya 6.0.0/6.0.1.