UPDATE THE SECOND: That was quick. Here's full details direct from Sony.
As expected, the game includes all the DLC -- including the Left Behind single-player add-on plus the Abandoned and Reclaimed Territories multiplayer packs -- and offers a bunch of preorder bonuses, largely for the multiplayer Factions mode but also offering increased crafting and healing speed in single player, along with bonus skins for Joel and Ellie once you've beaten the game once.
UPDATE: Shuhei Yoshida has confirmed that the remastered version of The Last of Us is coming to PS4, and that more details will be forthcoming soon. Separately, an Amazon listing suggests that the new package will include all the DLC plus commentary from the cast and creative director Neil Druckmann.
Original story follows.
Following Tomb Raider's example, the barely ten months old The Last of Us from Naughty Dog is getting a next-gen remaster on PlayStation 4.
Accidentally revealed on the Sony Entertainment Network site (the Web-based means of accessing the PlayStation Store, among other things) and, as these things often are, spotted by the eagle-eyed sleuths at NeoGAF, it seems that the new version will be a full retail release for $59.99, and if a statement made by a Sony Turkey executive a while back is to be believed, it will include all of the downloadable content, including the recent Left Behind story add-on.
The PlayStation 4 version will, according to the banner (above), be part of Sony's "Day 1 Digital" program, meaning it will be released simultaneously to both retail and the PlayStation Store. At the time of writing, the banner ad is still visible on the SEN site, but clicking it leads to an error page.
Sony is yet to officially announce the game, so a release date isn't yet known, but given how widespread this news is now, expect one before too long.