: I found this very enlightening. It seems that Halo 4 was built with the Halo
: 3 engine with upgrades instead of Reach. At least, that's the impression
: that I got from the videos. It's possible that they simply threw the Halo
: 3 first-person skin on the player in a Reach engine. However, I've often
: felt like Halo 4 was more akin to H3, especially in Forge and Theater
: where the limitations no longer existing in Reach were present once more.

The ammo counters are like the ones in Reach, the shield bar says "WARNING" when the shields are gone like in Reach, the AR would obviously be different, and once they decided to bring back the BR, starting with the last implementation makes sense. The motion tracker doesn't look quite like any of the games as far as I can remember, which is interesting, and I did catch the Halo 3 grenades at the top.
So, they were going to have Brutes, huh? I wonder why they decided against it.