News from the XNA team blog:
- Game Studio 4.0 for Xbox will be released "later this fall" (yes, that is deliberately vague :-)
- At that time we will start accepting 4.0 games into peer review
- There will be a 90 day window when you can submit both 3.1 and 4.0 games
- After 90 days, only 4.0 games will be accepted
Unless you are nearly done, now would be a great time to upgrade!