I dont know of any hybrid builds yet, but that's just not my style.
Operative Concealment is not business as usual. The fun factor was really taken out of the game play with the last nerf to knockdown and roll. The roll not so much but the KD nerf is huge. The shield probe buff is garbage, you still die in a few seconds in ranked.
I still put up nice damage as concealment, but dont get as many solo kills as I used too. This is my only character since launch, so I know the class and the fun factor is missing now. I'm not sure the devs know what they're doing, well, thats pretty evident with the game in general, not just this class.
It's really a shame, you dont see many concealment ops in regs or rateds, not joking there. It's really a dead class, but unfortunately for me, its my only class.