The Warzone updates sound cool. I'm kind of annoyed because the color grading that they're using doesn't really make sense to me.
For the Covenant you've already got the standard Blue/Red/Gold gradation. Why make it Red/White? It's not like there are a bunch of Red or Gold mobs in campaign. Just make the campaign tier Elite Minor blue, then Elite Major red and Zealot Gold. For the Forerunner I'm scared that the Orange and Red will be too similar to tell them apart. Why not reintroduce the Librarian's blue color?
ExWife and I were talking about this and he suggested using the same color gradation as the REQ packs to make it universal: Green/Blue/Purple/Gold, which would also make sense.
I'm also excited to hear that there will be more complex encounters as well. We saw a bit of this in Darkstar with the Soldiers constantly spawning Crawlers under the bases. Maybe we could get something similar with other bosses? Like maybe one of the Banshee bosses could spawn Jackal Snipers to take out people trying to take potshots at it with Railguns, or maybe Wraith bosses could spawn Grunts with Pools of Radiance or Talons of the Lost to take out enemy vehicles.
Make the mobs the hard counters to the counters for the bosses, so that you gain an advantage from actually taking them out aside from just thinning out the adds.