This was posted as a rumor on GoNintendo:
Hot on the heels of their recent press release confirming that MK Armageddon has in fact shipped more than 1 Million copies worldwide since its release last october Midway has confirmed the European release date as Friday 15th March 2007.
Promising to use the intuitive contol system on Wii, MK Armageddon looks set to be a smash hit. It will be the first title to utilize Nintendos Online System and the first fully fledged fighter to be released on Wii in the Pal territory. A nice position for Midway to be in indeed.
Now I haven't played a Mortal Kombat game in a LONG time (I have Deadly Alliance for GC unopened), but I'd really be interested if this is true. If it is, that would definitely be a step forward for Nintendo.