The co-president of Naughty Dog said in an interview with IGN that the new remastered version of the game for the PlayStation 4 is already being developed since the end of the PS3 version in the middle of last year.
According to the executive, the company anticipated feedback from players asking for a PS4 release and immediately began work on the game.
The Last of Us Remastered include all DLCs released to date and will cost the standard price of $59.99. The game will include comments of all scenes of the game, by Troy Baker and Ashley Johnson (who interpret Joel and Ellie) and also director Neil Druckmann.
The game will run remastered with 1080p resolution and 60fps, and will also include high-resolution textures, new character models, graphical improvements for shadows and lighting and other technical enhancements. Below you can see the official announcement video of the game for the PS4.