"This is something which you'll find out next week," he said. "I can't comment on this right now."
Logic says that if there was nothing to reveal, he would have just said that there wasn't anything to reveal -- but then this is the cloak-and-dagger world of video games PR that we're talking about here.
Limbo didn't get any additional content or DLC for its Xbox version, so if anything has been added to the PS3 and PC ports it will be completely new.
Find out whether or not there's any new content in the PS3 and PC versions of Limbo next week, then, when the PS3 version launches. The PC version will hit Steam on August 2. Playdead, meanwhile, is working on an as-yet unannounced new IP which Patti says is unlikely to be revealed this year.