This is the only 1 i got to in the Demo. please list the ones you know in the following format. thank you

Cloak Enhance:
Regular=faster transition in and out of stealth
Upgrade 1= no shadow cast while in stealth
Upgrade 2= Energy drains slower while in Stealth

We'll all see for sure on March 1st.

I found a complete list of the xbox360 perk upgrades online before, try to look for it

No, you should definitely have a look at the upgrades before you play. It's a bit hard to upgrade all of them (since there's a limited time in demo) and the challenges are pretty tedious (for cloak enhance I believe you have to kill enemies seconds after stealthing) so I suggest you pick out the ones you want.

a lot of the upgraded perk versions are awesome though.

I just watched this video, tells you alot about the progression system. Also makes a point of telling you camping doesn't pay lol.
http://blog.pikimal.com/geek/2011/02/10/crysis-2s-multiplayer-nanosuit-perks-revealed/

EDIT: for anyone who played the beta and used the air stomp, does that kill in one hit? The force it generates it definitely looks as though it should.

Armor
Air Stomp - Perform a powerful downwards attack when in the air
Proximity Alarm - Automatic Warning when enemy is nearby
Armor Enhance - Reduce drain speed of energy while in armor mode
Armor Enhance upgrade - Increases movement speed in armor mode
Armor Enhance upgrade 2 - Protects against Nanosuit Jamming
Threat Tracer - Highlights incoming bullet paths
Nano Recharge - Faster Health Recharge
Detonation Delay - Delays detonation of nearby enemy nades
Energy Transfer - Restore 50 Percent Energy with each kill

Stealth
Stealth Enhance - Faster transition in and out of stealth
Stealth Enhance Upgrade- + Removes Shadow while Cloaked
Covert Ops - Suppresses the sound of footsteps (Probably your own)
Cloak Tracker - Identifies when enemies enter stealth mode nearby
Jammer - Scrambles the radar of enemies within 10m Range
Blind spot - Protection from Maximum radar bonus [Is that jammer?]
Tracker - Highlight enemy routes [Probably footsteps]
Visor Enhance - Highlight enemies through weapon scopes

Power
Side pack - Allows additional magazine of primary ammunition to be carried
Side pack upgrade - Carry additional grenade
Side pack upgrade 2 - Carry more attachment ammo
Weapon pro - Faster Reload
Weapon pro upgrade - Faster aim down sights
Weapon pro upgrade 2 - Faster weapon switch
Aim Enhance - Decrease weapon recoil when aiming down sights
Aim Enhance Upgrade- +Reduces flinching (Something like that i don't remember the exact description sorry)
Aim Enhance upgrade 2 - Faster movement speed while ADS
Loadout Pro - Allows an additional primary weapon to be carried in place of a secondary
Rapid Fire - Faster fire rate on primary weapons
Point Fire Enhance - Reduce spread of primary when firing from the hip
Mobility Enhance - Reduce energy drain when sprinting or jumping
Retriever - Automaticly collect dog tags from fallen enemies (See this isn't rigged because there's much better perks here


Copy and pasted from http://www.gamesas.com/forums/viewtopic.php?f=21&t=6630 and I edited in some that I know of.