I think there's going to be cross-gen versions probably too. And they will give them subtitles like, "Big Boss Edition."
And maybe they will release it on Wiiu?
It's a safe bet hopefully. As for Orbis/Durango, KojiPro can't announce games for next gen systems that don't exist (yet)
But porting it to them would certainly ease development going into MGS5...
Or maybe Kojima is working on Orbis/Durango right now in secret?