User blog comment:Soldierscuzzy/Metal Gear Solid 5 Confirmed/@comment-4117012-20111118203039

according to this site:

http://gadgets.ndtv.com/shownews.aspx?id=GADEN20110188404&Sec=NEWS&nid=150978

I guess Kojima is working on Metal Gear Solid: Rising rather than a new Metal Gear franchie. I don't know. Maybe they fired Mineshi kimura and Kojima got his place as the director!