In an interview with IGN Sony's Scott Rohde did confirm that The Last Guardian is still in development within the Worldwide Studios family.
Rohde said he was "not going to announce what platform it's coming on, who's working on it, who's involved. But that is still a title that's absolutely in the mix at Worldwide Studios. That's the most you're gonna get."
So, The Last Guardian, in development since 2007 and announced five years ago is still in the mix on an unannounced platform. Rohde did add he "actually like[s] talking about The Last Guardian. I love that people are still interested in it. That's an honor to us. That's not just me spinning... It's really cool that people are still interested in it, and we're trying to make the best thing we can out of The Last Guardian."