Well, yeah, it's already been confirmed that there are multiple game rooms inside your team locker room. So, if we have more than 6 guys on at a time (which I'm sure we will especially in the beginning), we can break off into groups without having to do the "ok, you guys back out and come back in once we've started".
But my point about dividing into two teams is that unless everyone commits to being on every Friday night, there will definitely be lopsided teams. We could have 6 Seckz Panthers and 2 Crotch Sharks on one night...and then instead of just playing 4 on 4, we'd have to play 6 on 2. I really don't like that idea, and that reason alone would be enough to keep everybody in one group, in my opinion.
UNLESS, like I said, they allow you to be on more than one team this year. That way, everybody could be signed up for both teams, and you could play on your chosen team when the numbers are even, or switch over to help balance things out. That would be the best of both worlds in my opinion, but I don't know if EA would want people committed to more than one team at a time.