This announcement doesn't say lightgun or rail, but this IGN interview sure sounds like the definition of an on-rails shooter:

http://wii.ign.com/articles/954/954895p1.html

Steve: Our gameplay takes advantage of a guided and cinematic camera which allows us to frame the action on screen and deliver fantastic and gripping action sequences packed with loads of scares.

"guided and cinematic camera" sounds like on-rails.