Limbo is a puzzle platform game that was first released in July 2010 exclusively on Xbox Live Arcade, until a speculation about a PC release was leaked, and now a hint about a Playstation Network release comes out.
A rating that was posted on Korea Rating Board confirms that Limbo is coming to PSN. It is also rumored that Limbo will be also released for Microsoft Windows, because of a trailer that appeared on Steam. Though there is no official statement yet, I take this news as legit because it is not the first time that this happened, Braid was also a XBLA exclusive for months until it was made available for Playstation Network and Microsoft Windows.
Here is a translated version of the rating from the Korean Rating Board:
Wonjemyeong LIMBO Hangul expulsion LIMBO (Limbo) Sincheongsa Sony Computer Entertainment Korea Date of Classification 2011-06-29 Classification Number CC-NV-110629-003 Determining grades Rated MA15 + Sincheongsa Address 4-dong 869-9, Seocho-Gu, Seoul, Bangbae Spirit Building, 4th Floor Phone number 02-6001-6200 Representatives Shiroi Kawa Lodz (KAWAUCH SHIRO] Nationality Denmark Genre Adventure