Well. I understand that Rockstar wants to show something to ease the fans' growing anticipation and frustration due to lack of news since the trailer, but as some here have pointed out, the screenshots, especially the helicopter one, look slightly like GTA IV. As in slightly washed out and "muddy", a far cry from the trailer's vibrant, gorgeous colouring.
It's not news that official screenshots, especially with the rage engine look way inferior to the game in motion, so we'll have to see what it actually plays like. If anything, this says something about the aging console generation that holds back progress. It's a true feat to develop something just as grand on such old hardware. Alas, just imagine if Rockstar had developed this purely for the PC...
Regardless, I'm still confident in the fact that Rockstar will pull of a fantastic title regardless and it's good to see at least some new content. It will surely be a great game.