Ryu K. tipped us off (thanks!!) that Capcom squashed the Killer7 rumor. Chompman, a site admin from Capcom London explains in a forum post:
at least, not any time soon that’s for sure.
Yes, there was a Wii symbol on the Killer 7 gamesheet.
No, this doesn’t mean a Wii version is planned or in the pipeline.
(Yes that means we messed up the website- we were using the K7 sheet for testing on the test site and somehow it’s made its way onto the live one)
Yes, I feel like an idiot now, thank you for asking.
If that wasn’t enough to close the books on the Killer7 Wii rumor there is also a news post about the mistake on the front page. Maybe its for the better. Instead Grasshopper Manufacture can focus on developing No More Heroes.