SparkleMotion
Member
They said the original matchmaking uses whatever ranking they have in it. The improved matchmaking list just uses it better. It will also split teams up after a match and do other things that disrupt existing lobbies to make a better match for next round.
But it won't move any members off of existing teams. It will just take your team and find another team to play against. So, you could have two terriblen players on your team dragging the whole team down, and instead of balancing the two teams, they will just remove the other team and find an easier team for your existing team to play against.