I think WME is great and for sure it will be greater.
About 3d, well, I think more 3d models support like obj model will be great, because almost any 3d application support it and it is a txt file, not a binary file, easy to create scripts to manipulate it. Another good thing, I am only thinking, is bhv support for animations, and some support for programs, like poser, a great tool, you can get it very cheap (Poser 6 $29) or free (poser 5 and Daz studio)