As Sony stated on the stage, there is no need to introduce this game at all. It does all the talking on its own.
The gameplay does take place as Drake hops in a jeep and romps through a town as he races down a hill to a tower. We see everything in glorious graphics as fruit stands explode from bullets to people scattering to get out of the way of the jeep. All the way down we get the snarky remarks we expect from the crew.
You get full control of the jeep, but most of the chase seems to be rather scripted as usual for the series. It seems that you have just enough control to mess things up though, such as missing a short cut one too many times.
What do you think of the footage?