It looks like the Wii conversions of House of the Dead 2 & 3 sold well enough to bring the zombie lightgun series shambling back to life in an original title. Ditching the environmentalist angle of the core titles, HotD: Overkill seems to be aiming for a 70s pulp atmosphere:

http://www.youtube.com/watch?v=YKUD2sLE5rM

Not sure how successful the implementation will be, but the phrase “Slo-Mofo Time” has me grinning…