Here's a few:
1. A melee weapon that is "always on" when selected (no recharge) that you don't have to buy.
2. A Gatling gun that shoots accurately and for more than a yard relative scale.
3. Ability to issue orders to computer-generated teammates.
4. The ability to shoot out through your shield while protected from incoming fire.

More may follow...

The developers haven't confirmed that there will be a multiplayer mode in Raze 3. The only thing they've said in that line is that they would like to get as soon as the technology is good enough.

actualy they did say they were going to make multiplayer on raze 3

A-Wall

I know that this is off-subject, but it's actually A.W.O.L.
Absent With-Out Leave.

3.Ability to issue orders to computer generated teammates.

I agree with this, because my computer teammates sometimes
getting my favorite weapons and power-ups.
And also,here are some melee weapons.
Heat Knife,Laser Saber,Titanium Mace,Ice Samurai.

Sorry for the double post, and back on subject....
For Raze III:
AQOG's for the guns.
Changable ammunition.
As in....
Flak rounds (Flame)
Depleated Uranium rounds (armour peircing)
Standard rounds (Normal)

Perhaps visable armour changes? Amour the enhances, and you can see when it is on?
Maybe add something where as you take damage, blood and gore builds up on you.... I.E. When you get take a headshot, your skull is busted open, and stuff. If you die by a head shot, your head explodes, and your brains splatetr the opposing wall. Crotch shot is the same, but applying to things of the crotch. Butt shot could have perhaps would be complicated. Perhaps if you get shot in the leg (on harcore mode, if they add it) you are slowed down, perhaps to crawling. perhaps guns can be damaged by explodes, and can jam, and/or explode in your face, causing critical damage to your head/neck/chest....

And I believe once you're hit, (in hard core mode, again, if they add it), you start to bleed to death.

Perhaps levels with hordes of un-armed zombies, that have melee damage?

All these ideas are epic...

uhh i have a question
are the people who make the raze 3 game even looking at this forum for ideas?

i suggest u cant use any ability at all or any weapons so ppl can avoid getting killed by sum1 in the spawn protection(especially when they have a rocket launcher so they wont care since they have spawn shield)

Multiplayer, 'nuff said.

Read the title, "nuff said."

Anyways, I don't really know what to add other than a map editor.