Okay, I started a new runthrough and this time I noticed some arm dismemberments while I was in Prologue, now just getting into Act I and will continue to monitor again. Strangely when I loaded my saves from the first runthrough, again there's no dismemberment. Wondering if it has to do with the armor of the enemy, cos even in the Prologue, only the weaker human enemies get dismemberments, and not every time either.

Yes, Geralt has hacked the arms off human opponents in my game. I have no idea what makes this happen, but it does happen.

In The Witcher (1) you could lop off enemies heads and watch them roll across the ground. Was pretty cool, I miss that.

I've severed a few limbs. I remember the first time i noticed it cus I looked down and saw a couple hands but no body. The body laying a couple feet away was indeed armless. I don't think i triggered a special finisher for that one. I think it's just a relatively rare occurrence.

You have a chance to chop off an arm if you deal a fatal blow with a strong attack on a human or an elf. I wish there was a way to turn on dismemberment like you could in JK: Jedi Academy, it's an adult game after all...
Oh well, guess you can't have boobs AND guts in a M-rated game.

They gave us one of each in TW2 and TW1 respectively, maybe we'd see both in glorifying detail in Witcher 3!