I hate Maya, Just gonna say that to start.
Maya makes me want to crawl into a ball and cry sometimes
Anyway i don't know how much version 4 will change but i can guess alot.
So yea this might be pointless.
Depending on what you want to add to the game you can do it all in blender and import it into Maya as the final step (like i do)
What im hoping for is a editor for the game where you can just import models and build the scene in there and leave maya alone, In the corner, Nice and quiet (i know i know but i can dream, Unless its gonna happen then im happy