it actually surprising the amount of people claiming this to be CGI(not just this site)...I mean the very first trailer stated that it was all in-game...heck even before it was even announced Geoff Kieghly from gametrailers also stated that the trailer was using the game's own engine. granted the gameplay won't exactly look like the trailer shown but if you ever played the Uncharted it will be nothing short of amazing(graphic-wise as we haven't seen any gameplay yet)