Don't think I've seen this mentioned here, but it looks like
all characters are getting passive abilities based on their class. This was leaked by a data miner that is usually spot on about these things.
The basic breakdown is this:
Assault characters( Wraith, Revenant, Mirage, etc): Ability to carry an extra grenade per slot.
Recon characters (Pathfinder, Bloodhound, Cryto): Will be able to scan survey beacons just like Pathfinder's current passive. This might be an overall Pathfinder nerf unless they give him a new passive.
Support (Just Lifeline, lol): Will be able to use special blue bins scattered around the map to get better loot.
Defensive Characters ( Gibby, Casutic, Wattson): Will grant players shield health upon reviving them.