You might recognize some of these from the recent EGM cover story, but many of them are brand new. Also these are in hi-res digital format so they give a much better impression than the scans that were posted a few weeks back. The screens were first published (or leaked?) by German game site GameCity but Bungie will probably make these public soon. Untill then you can check them out in the story image section below.
Note: According to Bungie the screens are taken from an early alpha build with lots of placeholder graphics and without all graphical effects turned on. But they should still give a good indication of the graphical style of Halo 3.