SEGA has announced that House of the Dead 3 and 4 are coming to PlayStation Network.
Both House of the Dead 3 and House of the Dead 4 have been remastered, and are being released with HD graphics, trophies, and PlayStationMove support.
The House of the Dead 3 will be available on February 7, 2012. The House of the Dead 4 will be available in Spring (SEGA has not provided the exact release date).