I was browsing around the net and i found a bit of news about what kojima might be working on or wants to work on after MGS4. A bit old, i know. But ZOE is awesome and i hope that ZOE3 is his next project for ps3 of course. :) There is also news to snatcher? in one of the articles.
I know there was a buzz over ZOE3 a few years ago about being busy with MGS4 and PSM3, so i supplied the link below.
"Finally, it's the end of Snake, so I'd really want to start something really fresh and new when I create the game for the next one. However, maybe the sequel to ZOE, or a remake of Snatcher, for instance, if I just participate as a producer, yeah, that could be possible."
(CLICK on the two most recent "news" on the right)
-"More ZOE3 speculations"
-"Zone of the enders a high priority"
More ZOE3 stuff
here is your old article(if you wanted it - 2 years old)