Developer Insomniac's lead multiplayer programmer states:
I can't yet talk about all the things we've changed, but I really think that people will be very pleased to see how responsive this is to some concerns that have come out since we went live.
We've addressed a few key balance issues and put a big focus on making it possible to more effectively use a variety of strategic and team-based tactics in the game. I'm very excited to see how people like the change when it releases. That should happen very soon, so stay tuned.