It looks amazing. Graphically it will dominate the gaming community, that much I know. I feel that the inclusion of AA's and loadouts could either refresh the series and make it another really exciting chapter of the Halo saga or send it spinning off-course never to fully regain it's crown as king of the FPS's. From the gameplay we've seen so far I find it nearly impossible to discern which outcome might prevail.
However, if the words of many a players who have had the exciting opportunity to tour the fantastic world of Halo 4 at E3, RTX, and SDCC... one might come to the conclusion that Halo 4 is turning out to be the best Halo game to date. Better than Halo 3 and maybe even Halo 2.
My hopes are high.