So the currently unreleased Mercs are:
- (Recon) Aimee, Redeye, Phantom
- (Assault) Thunder
- (Medic) Phoenix
- (Fire Support) Stoker
- (Engineer) Turtle
Aimee can deploy motion sensors to detect enemy movement. Similar to Vassili’s heartbeat sensor except his only needs enemies in radius to be detected. Her’s just played an audio warning when enemies passed by.
Redeye can throw smoke grenades and use infared goggles to get clearer visuals on the enemy, even through smoke and other non-solid visual obstructions.
Phantom can go practically invisible (90% transparent, more specifically) and use a sword as his primary weapon to stealth kill enemies. Feedback stated that he was a balance nightmare and didn’t contribute much to the objective by his playstyle alone, so his mechanics are subject to change.
Thunder is similar to Fragger, except he throws concussion grenades and uses a higher RoF, higher ammo capacity LMG as his primary. I’m personally looking forward to this guy as he seems like a mix between Fragger and Rhino, my two current favorite Mercs.
Phoenix emits healing pulses instead of giving medpacks, and he can self-revive. He also carries a defib like every other Medic Merc.
Stoker can throw molotovs for long-term area denial, and can deploy an ammo station. Similar in spirit to Kira.
Turtle can deploy a small, durable wall for cover. Since he’s an Engineer Merc, he also plays the objective faster. So far, this is the only Merc that has never been released even in CBT.
Just pulled all this information off the wiki. To my knowledge, each and every one of these Mercs is planned to be returning to the battlefield. If you’d like to get more information on specific loadouts used, maybe read their bio and such, then I suggest you go check there.