According to an IGN translation, Sulun told CNN Turk, "There is no information about a new The Last of Us game but I can share this knowledge: As of this summer, The Last of Us will be on the PS4. Both on PSN and physically. The PS4 version will also include the DLC so you will be able to play Left Behind as well."
To reiterate, Sony hasn't announced a PS4 version of The Last of Us; yesterday the company published a list of the games confirmed as coming to the system this year, and there was no sign of Ellie and Joel's adventure. We've contacted Sony to clarify Sulun's comments.
That said, Naughty Dog has been cautious on the subject. When queried on the possibility of a PS4 port by Eurogamer, Creative Director Neil Druckman said last month, "We have such limited resources, and it's a question of where you put the resources. It's something where we can have a feel of where the demand is, and where our time is best spent. It's something that we'll figure out as we move forward."
Update: When approached, a representative for Sony Computer Entertainment Europe provided Joystiq with the following statement: "'At no time have we announced that The Last of Us is coming to PS4 and therefore, have nothing to say on the subject."
The Last of Us (04/17/13)