Well I'm curious. I was on IGN and they stated that Shuhei Yoshida from Sony Worldwide studious suggested that EVERY Sony owned developer is doing a game for PS4. So, does this mean PD is doing at least 2 games?
http://www.ign.com/articles/2013/02/25/every-sony-owned-studio-is-working-on-ps4-games
Playstation = The Beast from the East
Sony + Nintendo = WIN! PS3 + PSV + PS4 + Wii U + 3DS