Last night I noticed the patch that was released last week before the DLC came out affects competition in RR2 and CE2; specifically, it removes the lap-skipping shortcuts in those levels. In Rooftop Run 2 an invisible wall appears after the first lap preventing you from backtracking, and in Cool Edge 2 you can't homing attack up the icicle anymore.
http://www.youtube.com/watch?v=Ye8gfP4axqoThe question now is what we do about it, since obviously the times on the charts right now aren't possible if you have the latest patch... patches CAN be removed, so it's just a matter of whether we decide to allow people to do that (which if we don't disallows anyone without XBL from competing in those levels, or a PS3 for that matter since evidently the PS3's never getting the patch/dlc. :P Although it was the same case with Sonic 06's DLC).