One of the things that really hurt Crysis 2 in my opinion was the 2 weapon carry limit. I hope they bring back a system that let's you carry more guns. Obviously you don't want a cluttered inventory, but I always feel you should be able to carry one gun from each category.

I also hope they make the shot gun and hand guns more useful since these are usually the most fun to use, but they are often impractical. I liked how in Crysis 1 you should change the shot gun blast frmo wide to narrow making it more useful.