PixelJunk Shooter was a fine addition to the PixelJunk franchise and PixelJunk Shooter 2 is heavily anticipated by PlayStation Network fans all around the world.
So when exactly is the game due for release? Well, we still don't know, because Q-Games can't say anything other than "soon".
In an interview with the PlayStation Blog, Q-Games Matt Morton said "Right now, we're trying to go in for certification." Hopefully they can get that quickly so Q-Games can launch the sequel sooner, rather than later.
Source: PlayStation Blog