Call of Duty Expectations for next zombies game?

I used to play zombies a lot, but just got bored lol. I had 100+ on a few maps. So while I was thinking about it, I was wondering what the next one (if there is a next one), will be like. I'm guessing zombies will return on the next treyarch made cod game. So what do you guys think will be new in the next COD Zombies game?

I reckon that there will be a lot more in game effects, a decent new story line, different modes in zombies (become one, etc..) new gun, something popular like a ray gun, Easter eggs and a lot more haha.

I hope they bring something similar to Black Ops zombies. I didn't really like Black Ops 2 when it came to zombies - only because everything was so complex.

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