There is a rumor going on at Nforums that someone knows someone who works for IGN. And they have been told that a cancelled FPS that a halo style feel is being ported over to the Wii. The game was said to be a Halo Killer and really reminds me of the old Xenias rumors. Here is some detail on it:
Alright and here is the update (drum roll please):
My buddy talked with matt the nintendo editor at IGN (how cool is that and matt 
had interesting news…
But before I get into that you need to here this first,
There was a game being developed for the PC (wasn’t given a title) but was cancelled due to complications in the programming. This game was going to be a huge FPS halo style shooter. Alex (my friend) said that it was going to be better than halo, in every aspect. The controls, graphics, online. It took place in the future so I’m guessing there would be futuristic weapons and all that jazz.
Now back to the nintendo related stuff. Matt was saying that Nintendo showed A LOT of interest, and they were willing to re-write the whole programming gig (I’m not a programmer, I don’t know the programming lingo) because the big N thought it showed so much promise.
Source
Ah so as you can see it’s from some dude who supposedly talked to Matt and he talked to him about this halo-killer. It was supposed to be better in controls, graphics, online, ect. So as stated Nintendo liked the idea so picked it up and are going to put it on the Wii. So the dude who wrote this his friend said he wanted to prove this to be true so badly that he put up concept art from the PC game before it was cancelled. Remember this is from the PC version but still concept art so no matter:
Concept Art
Ah so some pretty cool looking concept art. This is a rumor to take very lightly but still look into it. Nintendo has yet to come out with some really big name online shooter type franchise to counter games like Halo. So Nintendo is probably definetly looking into that category like they did with Disaster: Day of Crisis unto the GTA series. So I’ll keep you posted on this and it’s said to be shown at LGC. Gosh gotta love LGC eh.
Zucas
NOTE: THERE ARE PICTURES OF THIS GAME, IF YOU WANT TO VIEW GO TO THE SITE BELOW
Cancelled PC FPS Coming to Wii Exclusively? « Gamers Paradise