They've already delivered on your weapons request, but they're limiting customization to meaningful changes; Changes that actually effect how you play the game.
As for what I want:
Good performance at the maximum settings (DX11 - 1920x1080 with 0-4xAA) on a 5870
At least an 8 hour single player campaign
Multiple classes of enemies (like in Warhead)
Best dang multi-player I'll ever play
A good amount of diverse multi-player maps
A good amount of modules, etc.
I dont think crytek will put in weapon mods, simply because crysis 2 went platform. The ps3 and 360 is holding pc back. I hope they will. Instead of being able to pull out gernade you should be able to do weapon mod. Like a directional button or something