While Phantom Pain is still a ways off, Metal Gear Solid V: Ground Zeroes is approaching quickly -- as in, it's dropping in March 2014. We already knew the latter was going to be just a taste of what's to come in Phantom Pain, but now we have a little more info from Kojima himself.
The Metal Gear director states, "Ground Zeroes has a relatively small field compared to the main game, which is hundreds of times larger." He also notes that time zones will not change in real time, and that Ground Zeroes will serve as a tutorial of sorts.
Hundreds of times larger eh? Zeroes is either really small, or Phantom Pain is really large. I can't wait to see what both have to offer.