With "cp's on the rogue" It should give you the cp's if you kill something with a dmging finisher but just like almost everything its still programmed like it is on live and requires a target. That's actually the issue with all the cp problems on beta they did put cp's on the rogue but they halfass'd it in that they didn't change the things programmed to screw over cp's.
Its not a new resource so the game still does everything as if cp's were still cp's like live so anything that would wipe them out on live still does it on beta. And pretty much any issues with cp's on beta can be pointed to this and to make it worse they were clueless on this its not just some bug they've been working on fixing they had no idea there was even any issues.... That's how much they look into rogues..