We need guns.. Lots of guns.
I would love to see a huge arsenal of melee weapons: batons, shurikens, knives, swords, axes, (chainsaws?) hammers etc.
Bring in a big ton of firearms.
Classic handguns like revolvers (Colt .45, Magnum pistols etc.) Assault Rifles, Snipers (the FR-F6 bullpup or the classic Barrett M-90).
Of course High-Tech energy type weapons should be included.. But also more ''primitive'' weapons like bows. Longbows, Reflex bows, Composite bows, Recurve bows, compund bows, maybe even self-bows. A type of crossbow would be great too.
But, let's not forget stationary weapons like turrets and mortars. And why not add some explosive weapons like missiles, grenades etc.

! Railguns should also be part of the game (Deathwind anyone?)
All of these weapons would be even better with a wide variety of ammo types.
All in all, it's a lot. Let's just hope the devs take their time with this game, and pack it with as much content as they can. I'm hyped!!