Has anyone been experimenting with Game Center? The thing I'm most curious about is how the login works. Is the player persistently logged into Game Center by just having their device on, or will there be a login link within the games, similar to OpenFeint? Any insight would be greatly apprecieted, Thanks.
I would suggest you look on the apple dev forums for iphone os 4 as the answer to this would require sharing info that is not yet fully public.