Something called Mortal Kombat Komplete Edition has been tagged by the BBFC, the UK’s Classification authority.
There are absolutely zero details on what it is, though it probably wouldn’t be unreasonable to expect a Mortal Kombat re-release with all the character DLC packed in. The classification lists it for a January 17, 2012 release.
Could this be the MK surprise creator Ed Boon teased a while back? Aaaaand we’re waiting.