Possible SPOILERS Below...
It looks like the stormtroopers got a new look in J.J. Abrams' Star Wars: Episode VII. These images were posted by Indie Revolver, who says that these are new designs for the stormtrooper and snowtrooper.
If you can't tell from the designs, it looks like they were inspired by the original concept art by Ralph McQuarrie and Joe Johnston. The connected black visor piece of the helmet is one of the most prominent design changes in these that seems to have come from McQuarrie's designs.
I love that the production designers were inspired by McQuarrie's work. The first time we saw it was with the reveal of the new X-Wing. Even though there is no official confirmation that these photos are legit, I'd like to think that they are because they are pretty damn cool.
Thanks to 501st Legion for the photos!