Not really sure I'm looking forward to that. How will that intefeer with games that already have a game-chat in the game and part of the online experience?
I'm also a bit fed up with games (i.e. KZ2) that don't let me mute all other players not in my squad by default. And I really hope they give us the option to turn that stupid ticker off and smaller fonts....
If it's anything like XBL, you can have multiple chat channels open at the same time, and can switch between them.