With ''room to spare'' apparently, according to Kojima himself. Though Phantom Pain is unfortunately still a ways off, so it's tough to say if Kojima will stay true to his word as development progresses. But considering how absolutely gorgeous that game looks, and not to mention its sense of scale, it'd be pretty fucking swell if it could also stay at a steady 60.
Most games on current-gen systems are still mostly running at 30fps, and of course it's the bump in resolution that has been given priority. As such, games locked at 30fps seems like it would still continue to be the norm for consoles, and that may still be the case. But hey, if Phantom Pain can look as good as it does while also pulling off 60fps, then hopefully that'll mean the ratio of console games hitting 30 or 60 will rise!
It's worth noting that he was specifically referring to the PS4 version, though, so I wonder if this could be another notch on the divide between multi-platform games. Given the history MGS has with Sony platforms, however, it probably shouldn't come to much surprise anyway that MGSV will perhaps favour the PS4.