Here's some quotes from Joystiq's preview
"These touches stand out against the almost subtle enhancements of Reach's improved technology. Spear is one of those just look how far you can see levels, almost bragging how good the draw distance is; or how many of those Covenant troops, each an individual AI, are all over place."
And here's what Kotaku said.
30 In The Sky, Giants Below
The second mission I played, Tip of the Spear, was the grandest level of a Halo game I've ever played. We were out on rocky hills, dozens of Warthogs racing toward dozens of Covenant. Past an intro cutscene and into the playable action, my Noble 6 was in the thick of a firefight against a rush of Covenant troops. I looked toward the sky and counted at least 30 vehicles in combat in the air, UNSC craft vs. Covenant ships big and small. In the distance I saw rows of tanks against huge Covenant walkers. For part of this mission you're driving a Warthog that is armed with some very powerful rockets. You're dealing with massive enemy Wraith tanks and the new Halo Reach enemy vehicle, the Revenant, which is tank in its own right, bigger than a Ghost and smaller than a Wraith (it's in the bottom image of this post). In this mission a Halo game finally feels again like one did when you first hit land in the original Halo: it feels not like a battle but like a war.
