Concealment:
Debilitate should be baseline as it's the Operative's only way, at least for the discipline I chose, to stun their enemies. Most people are obviously going to choose it over the other options because without it the crowd control element of the game diminishes, and you're left being incredibly vulnerable. Also, I'm not sure if I like Overload Shot being removed as I used the ability in my rotation while waiting for Veiled Strike to get off cooldown if I had any energy remaining, so I could use a Tactical Advantage on Laceration after using it. Since I'm not a healer, I decided to read through others' feedback and it appears Overload Shot was their primary DPS ability to use, and now they're stuck with a filler ability that doesn't do squat.
As a side note, why did you guys rush this one out so fast that not even a dropdown option was made to access the mounts panel? Now I can't test out the Level 3 Riding Skill you gave us, let alone riding any mount to begin with, to travel faster for testing the class. I just see it as a massive inconvenience that could've been prevented if this stage of the PTS was released a little later.