It looks as though Limbo is set to be released on PC, if some snooping done by a NeoGAF user is any indication.
According to a registery code for a trailer found on the site, Playdead Studios is set to release its XBLA platformer.
That's about it really, but it wouldn't have the code in there if it wasn't coming. We don't think, anyway.
We'll send the obligatory mail.