Auto balancing is sure to make people mad. Imagine A-wing lamers getting to play twice as rebels because they were the "best" player and get switched to the team they just obliterated and use A-wing entire match again. Or perhaps you just got stomped as Imperial in Fighter Squadron or Walker Assault and then getting switched to play as Imperial yet again. I wonder if it will balance based on score or rank. It will be interesting to say the least.
They autobalance will happen between matches, not rounds.
So you still have to play on both sides per map. After those two rounds are done the autobalance will occur.