Woah, Halo 4 looks absolutely awesome, even on IGN's player. Not massively surprising given that it was already gorgeous and just was held back by the 360s resolution, framerate, and AA -- but that is still prettier than I expected.
Weird resolution for the H2A campaign and slightly disappointing -- though I imagine a whole slew of technical bottlenecks are present simply trying to keep the original engine underneath. Considering how much better Halo 4 and H2A multiplayer look than the H2A campaign, I'd genuinely be surprised if it was a console limitation.