As far as i know, they're nerfing some key abilities of the poly-rogue op build. Adrenaline, skin graft, maybe even executioner.
I think that when the game will be released, this thing will be balanced. Homewer i hope that will be still viable, it was really fun mixing polymorph mechanic with scoundrel to create a super lethal assassin, so i would like a balanced/moderate nerf.