It's nice to see this but...
"Survival now takes place in procedurally generated levels, allowing greater mission variety, challenge, and replayability."
You're shoving us in larger maps to make the air supply harder to get to, with RNG drops for oxygen? I'd like to see a survival where we actually survive against enemy waves, not just suffocate.
I've also noticed the big ones only drop in certain locations before they repeat again, once you activate the last supply it spawns in the beginning of the map (60s remaining anyone?). The spawn rate seems nerfed compared to survival weekend as well.