The code comes from a pirated version of Grand Theft Auto V for Xbox 360.
Grand Theft Auto V isn't technically out until tomorrow, but it hasn't stopped pirates from getting their grubby little hands on it. And pirates, being the crafty little buggers they are, aren't just playing the game, they are disassembling it and poking around in its guts. As such, code from a configuration file allegedly coming from a pirated Xbox 360 version of the game has appeared on pastebin, and apparently points towards a PC and PS4 version of the game.
Here are two screen-grabs of the relevant sections of code:
The PC code is fairly obvious, and if you're wondering what the hell "Orbis" is, it was the original code name of the PS4 back when the dev kits were being handed out to developers.
Take this all with a grain of salt however, it is after all, the word of a pirate, and could have been entirely faked. But given GTA's history of releasing on PC, and the fact that the PS4 and Xbox One are right around the corner, it does seem pretty likely that we will see a next-gen release of the game at some point.
Source & Images: Dualshockers