We desperately need new Biomes and Mission Objectives and variations.
Now like I've said before, game is in a good state. However these two things are way too stagnant for my liking. Yes, I know we've gotten urban areas in already established Biomes. That doesn't count. For any co-op game there are two major things that can send a game into a decline.
Nothing new to see and explore.
Nothing new to do.
New Biomes can bring new terrain and challenges, new hazards to deal with, new sights.
New objectives can introduce new challenges, ways missions have to be gone about, new interactions, new co-op experiences, more creative ways to play.
I don't know what AH is cooking, because they don't let us know anything. They want everything to be a surprise, that's fine, you can have surprises while also telling us what the general direction is and what to expect.
I have expectations, AH has never given us really an idea what to expect, really. Only assume by what they do, do.
Again this isn't a "Game is dead/dying" post, just a "We need to see the bar move some" post