It seems that Hideo Kojima has confirmed Metal Gear Solid 5 which will run on the Kojima Productions new FOX engine. Kojima stated to IG Magazine
“About Metal Gear Solid 5, I can tell you two things. There will be much question of infiltration, espionage, and convincing people to give you ‘a favor’ like in the last Metal Gear Solid” Kojima continued ”We have not yet finished with Solid Snake, despite the fact that I wanted to let him die at the end of Guns of the Patriots.”
Nothing else has been confirmed. Considering it’s this late in the console cycle it’s probably safe to assume that the next MGS will be coming to the PS4 and possibly the Xbox “720″.