A new multiplayer team, hey heres a thought get dice or learn from em...
how about infected nanosuiters that went mad, remember when prophet had to kill himself otherwise the suit or something took control?
new locations - eg deserts antartica etc
special adaptable weapon or tool - whoops the nanosuit already is one
nomad! psycho!
power stuggle
different types of aliens for different climates, for example say in an icy place the are like hunters and more denser maps like buildings they ought to be like predators
alien weapons
destruction!
much stronger nanosuit so it beats a spartan 2x, an add on that lets you have extra power at the price of being slower or something i dunno
badass weapons and bosses!
vehicles but good ones
it would be cool if you could hijack an alien skeleton from a possible experience of prophet if we play as alcatraz again...
loads of things to think about
make aliens that can talk or badass ones like predators who admire honor or something
if your energy gets fully depleated in armor mode make the suit flash like a flashbang or a small explosion to stun so you can make a get away
- new abilities that are awesome!

lol

'Power mode' works alot better than the radial menu, and has been expressed by multiple people. PC gamers on the whole seem to just love unnecessary complexity because it makes them feel 'L33t'

Meh, "Power mode" is "working" better because you only have to keys/buttons. And I am pretty sure Crytek did this because the wheel would be indeed difficult to handle with a gamepad.
I, on the other hand, thought it was pretty easy to use. Just put the weel on the middle mouse button and everything works just fine.

And it surely did not make me feel "L33T", I just used it and everything was fine. Now I am missing the possibilities the old system gave me and I was more than one time pissed because simple (and slooow) running used up all my energy and because the "power mode" which made me send things into an low earth orbit is now replaced by a lame "power kick" which will not even make a car sliding 3 meters.

In fairness, I recently sorted out a new PC and re-bought Crysis. I have since changed my opinion on the matter and think that the lack of features/options is something which is definitely for the worse.

Hotkeys are cool, and could work if powers were separated. I just forgot how much I enjoyed having to pick between defence and offence in Crysis, and miss not having to do so in C2.

..a start would be bringing back normal sprint, and upping the power mode consumption while in cloak. I want to be able to choose when to activate power mode, and that choice shouldn't be between running and walking.