It depends a bit. I get RSS feeds from both Playstation blogs, so that can be one of the first places I see the news of any newly announced games, and is generally high in quality. Other than that, there's a good chance I see the news on the gamrConnect forums, and I usually surf to IGN, Eurogamer, VG247, CVG, Joystiq and Kotaku for more info or first-look previews.
For trailers, I always go to YouTube. I rarely visit GameTrailers, but I watch their reviews from time to time, if it's a game I'm not all fired up about. I don't want to see too much of a game if I'm really interested, with spoilers or interesting info and stuff like that.
If it's an older game, gamrReview is a great place for some good info, and is one of my first choices for visiting. Wikipedia and YouTube come afterwards, maybe followed by a Google search or two.
And looking forward to the new changes. 
