It's interesting to see MGS's distinctive stealth applied to an open world. I particularly like the combination of C4 and a Jeep with the Fulton Recovery System to take out an enemy helicopter. It also looks lovely - that's going to be one hell of a beautiful place to explore.
Here's The Metal Gear Solid 5 Gamescom 2014 Demo
Here's the full Gamescom demo of MG5 5 (via IGN) with all the horse poop and open world stealthing you can eat. It also shows the multiplayer that leaked the other day.