So, Halo 4 is being shown today. Embargoes will have ended by the time most people see this, and a plethora of media will be out there. For now though, 2 screens seemed to have surfaced.
I didn't like the new armor for Master Chief we saw in the CG reveal trailer, and I highly dislike it as seen in the new Halo 4/Halo Universe McFarlane figures shown last month, but in-game it looks awesome. I can't wait to see more.
The gun appears to be a BR (Battle Rilfe) like from Halo 2 and 3, but it looks different. Hopefully we'll have details soon.