Hopefully none since its a Nexus device, but I wouldn't put it past them to do something or try. I've actually worried about this myself; my Atrix is painfully scarred with the AT&T emblem in the notification bar and among other places. I hope to God they keep their iPhone ways away from this phone.
I think it is going to be handled the same way the N1 was handled. No fanfare and AT&T allows the phone to run on their network by having a specific network plan configuration for it. I have the N1 and that is what they did. I have a BB data plan on it.