I think going by what Creech posted, it'll be the amount of achievements we unlock to the amount of trophies they unlock. So no scores, because the systems are different. Meaning it will be one big team.
But if it does end up being teams of 4 for whatever reason, then lets join up and hold hands!
If you do GSL, wanna team up... It's been a tradition where me and Sean have normally been on the same team for the past 2/3 years but the other guys have changed each season. If I can get Sean to participate again, you want to jump in?
Edit: Actually I don't think it'll be 4 team based if it's x360a vs. PS3T...