I have some ideas for future mp updates.

1. New Mode

• Something like MVP(That could be fun)... Group of 8? players will try to kill a boss. I was really missing any boss in singleplayer.
• In 2nd mode idea is first team defending and second team attacking... (I think this will require new map)... Second team must do several objectives like bring C4 from heli and destroy this doors to go through, Escort tank because you need it to destroy their base or something like that. and ofc first team must prevent them from doing that. They can found C4 and rocketlaunchers on rooftops etc.
• next mode is something like search and destroy... Remember destroying those things in the end of singeplayer?
• MP dont need to be only vs. players so you could defend something for some time and attacking enemies could be these monsters from singleplayer. It could be for 16players

2. New Map

• park at the end of singleplayer (Central park)
• Prophet said that "they are everywhere" so - Map with snow(Could be that sunk boat from Crysis 1), Tropical Island(Again could be something like island from Crysis 1), Castle or something like that...
• For MVP mode It could be simple arena with some ammo ^^
• for search and destroy it could be fuel dump
• of course I almost forget.... what about New York airport.

I think thats all... I know that all of my ideas are a lot of work but new content would be great and I am sure that you are plaining dlc etc.

**BUT FIX BUGS FIRST... THEY ARE TERRIBLE...**