Here we go for the Cyberknight.
First of all: I understand the Cyberknight as some sort of futuristic streetwarrior with bionic implants etc. If I got that wrong, maybe the following ideas might not fit to that sort of profession.
Level 0
No Orbital Strike and no sprint.
Level 1 : Bionic Legs Upgrade
Sprint available
Level 2 : Satellite Hacker
Orbital Strike becomes available
Level 4 : Surveillance Satellite
The Cyberknight becomes aware of the positions of each player. Imagine this like the zoom mode of the Railgun except that this time it is ALWAYS shown on the HUD and it neither zooms nor supports the Railgun's targetting system (no player model displayed if you move your mouse over an opponent).
This sounds pretty powerful, but don't forget that the Cyberknight can neither shoot through walls nor distinguish between teammate and opponent.
Level 5 : Steel Skin Implants
More Armor at start
Level 6 : Nanobot Immune System
Complete imunity to slime and poison
Level 7 : Nanobot Repair Tool 1.0
Several little Nanobots inside the body of the Cyberknight will try to slowly regenerate his health to 50 if less.
Level 8 : Satellite Remote Control
The Orbital Strike is now even bigger. Additionally the strike now needs to press the Fortress Button twice: 1 time to throw the ground marker and a second time to activate the "Satellite Cannon". On the other hand however the Satellite needs a bit longer to power up again (to balance this powerful weapon)...
Level 9 : Bionic Eye Implant
The awareness as described for level up 4 now distinguishes the Teams (however the spy is always displayed in the colour which he wears at that moment, making him somewhat of a problem for the Cyberknight) and also shows the positions of the two flags.
With that improvement the Cyberknight becomes a very useful teammember, as it can spot out non-spy attackers that are trying to sneak into the flag-room.
This may sound pretty powerful, but actually it is level 9! You must also remember that "awareness" doesn't protect you from "power". So this is mainly useful against non-spy-sneakers, but doesn't really help in an open fight with several enemies attacking...