http://www.n4g.com/ps3/News-164427.aspx

Looks like Kojima is considering MGS5. It wouldn't be the first time he said he was done with MGS series.

I can only hope it involes either

1) Playing as The Boss
2) More Big Boss
3) Playing as Ocelot
4) Playing MGS2 from Snake's point of view rather than Raiden's?

Or maybe some Co-op? One plays Big Boss, the other plays Ocelot?