nuh uh.... i've morphed to a queen in a marine mission (Betrayal, in the egg pit) and everything was the same, vision wise.

Ya me too dunno if it was in betrayal

Well I didn't mention aliens but I didn't exactly say they did work.. .sry if I caused confusion
Yes alien vision works.

if you want the codes then here ya go. i have some hints here too.Cheat mode:
Press [Enter] during game play, type one of the following codes, then press [Enter] again to activate the corresponding cheat function. The sound of the predators mask switching vision types will confirm correct code entry. Note: There is a space between and the remaining portion of each code.

Effect Code
Toggle invincibility mpcanthurtme
All weapons and ammo mpschuckit
Full armor mpsmithy
Full ammunition mpkohler
Full ammunition mpstockpile
Unlimited ammunition mpbunker
Level select for all three species mpxfiles
Teleport to level start with default conditions mpbeamme
Set health to indicated number mpdoctordoctor
Change into indicated character type mpmorph
Toggle no clipping mpsixthsense
Toggle third person view mpicu
Toggle speed display mptachometer
Toggle size display mpsizeme
Toggle rotation display mpgrs
Show position info on/off mpgps
Use keys to edit FOV value mpfov
Use keys to edit vertext tint mpvertextint
Use keys to edit light amplification mplightadd
Use keys to edit light scale mplightscale
Use keys to edit weapon breach mpbreach
Use keys to edit weapon offset 1 mpwmpos
Use keys to edit weapon offset 2 mpwpos
Marines have slurred voice mpmillertime
Unknown mpreloadbutes
Unknown mptriggers
Unknown mpmph
Unknown mpconfig
Unknown mpdeathtoall

Character types:
Use one of the following entries with the mpmorph code.
alien
apesuit
chestburster
combatsynth
convict
drone
droppilot
drunkardtechmale
eisenberg
exosuit
facehugger
femalelabsynth
femalelabtech
grenadier
guard
guard1
guard2
guard3
guardofficer
harrison
hazmat
heavypredator
laboror
lightpredator
malelabsynth
malelabtech
marine
marine duke
mccain
meanguard
merc1
merc2
merc3
merc4
mhawkpredator
minigunner
obrian
officer
pocguard
pocofficer
praetorian
predalien
predator
pulseriflegirl
pulserifleguy
queen
railgunner
runner
rykov
rykovjr
sadargunner
scientist
scientist1
scientist2
scientist3
scientistchief
smartgunner
smuggler
tamiko

Hint: Strange guard voices:
Enable the mpmillertime code and go to any level. Go near a guard and he will have a high voice and sounded as if he is drunk.

Hint: Quick minigun fire:
In single player or multi-player mode, select the minigun and press [Secondary Fire]. The minigun will "warm up" and constantly spin the barrels until press [Secondary Fire] again or switch to another weapon. While this feature is active, the minigun will fire immediately after pressing [Fire] -- it no longer needs to "spin up" or "spin down", and will also fire more accurately. Using this technique will allow you to easily wipe out the Praetorian Aliens or Assault Predators. Note: In multi-player mode, only the Corporate AT officer can use the minigun as a set weapon, and they are very rare weapons in a normal multi-player game.

Hint: Queen head bite:
Start any mission, then enable the mpmorph drone code. Next, go up to a civilian and get into head bite position, but do not kill him. Enable the mpmorph queen code. Note: The head bite will be your only attack; use it carefully.

There you go. that's all the codes i can find.