Looks like EA was at one point planning on porting Dead Space 2 to the Wii. Now it has been scrapped completely as indicated by the job portfolios of EA designer Gerry Sakkas and freelance developer Matt Spriggens.
The Wii is no stranger to the Dead Space franchise, having received the once exclusive prequel Dead Space: Extraction. It never received a port of the original game though, and seeing how EA was at least considering having a port of Dead Space 2 on the Wii probably suggests that the publisher still has intentions for the franchise on the Wii. Why not release something for the 3DS?
[Source]