Sega announced this morning that both House of the Dead 3 and House of the Dead 4 will be coming to the PS3 as downloadable titles on the PlayStation Network. Both will include Move support.
While Sega says both games "have been updated with HD graphics", don't go expecting a big HD overhaul. They've just been cleaned up a little.
HotD3 will be out on February 7, with HotD4 expected in the Australian autumn.