And anyways, Kojima said he was not doing anything more after 5, but didn't deny that there won't be MGS5, he just won't produce it.
EDIT: But strangly, looking closer at the page, the 'Konami Productions' symbol is the Foxhound symbol in which they used for Metal Gear Solid but they use for all their games now? Hmm, I'm stumped. This makes me happy