Well the first trailer of the new movie is due very soon, and leading up to that more images are being released, including the first look at the new Enterprise design:
Which was released at EW.com, along with a little into interview with J.J. Abrams. I think the design is mostly ok (I especially like the new deflector), but I wish the engineering hull wasn't jutting forward so much...
The first proper posters (rather than convention ones) have also been released, and look like this:
As reported by TrekMovie.com, the new posters are also available as wallpapers on the official site.