15. The Last Guardian
https://www.youtube.com/watch?v=0dWWRI-cRrY We're sadly still waiting on this one, but back in 2009 players were still very much enamoured with the game-changing Shadow of the Colossus - itself Team ICO's second game, and one that helped kickstart the 'games can be art' movement. Last Guardian appeared to show a young boy playing with a mythical hybrid creature comprised of many others - although the general feeling overall was that of wonderment and whimsy, rather than the more action-heavy trailers we usually get at the likes of E3. Maybe some day it'll show up, but for now it's more likely it's actually been
cancelled.