Halo 4 Premium Theme Reveals New Concept Art

343 Industries recently released a premium Xbox 360 theme for Halo 4. Regardless of whether or not you decide to buy it, you can still check out the purty images from it for no charge.

The first image (via GI) shows a Pelican dropship flying near a massive, floating installation. Halo 4 is set on a Forerunner world encased in a shell. Presumably the structure we see in this picture is the underside of that shell.

The other image could be an interior shot of the shell, or a look at some other Forerunner base on the planet. Like most buildings in science fiction, it looks way too clean and new. Maybe the folks who made this base haven't left?

This is concept art rather than screenshots so these visuals aren't necessarily final. However, if Microsoft singled them out for the Xbox 360 theme, they're probably close enough to the real deal. If you're interested in buying the theme, it'll cost you 240 MS Points ($3) to download. Otherwise, just check out the images below.