User blog comment:Henshin86/Olin unmasks new MP features/@comment-3145169-20101028151529/@comment-3128308-20101028152130

Yes, "-Splitscreen Online is now confirmed for the PS3 after already being confirmed for the 360.

-Players can ether be guests or can sign in with their own Gamertag (360 only, the PS3 can only do Guests). Guests can rank up, but their stats will not be saved. "

It'll be differant depending on your system though.