Returning from last year is the Gamestop weekly blog for Madden 10 which apparently will offer a new posting each Monday until release. At this point it is uncertain whether they will be replacing the Inside EA blogs and given that most of the info on the game is already out there the value of the Gamestop offerings will likely be limited.
The first blog reveals the intro video for the game which you can check out here. It features the cover athletes Troy Polamalu and Larry Fitzgerald and highlights of theirs courtesy of NFL Films.