Quote Originally Posted by PopeJual View Post
My understanding of the upcoming change is that it will require a critical confirmation just like Vorpal does.

If you only hit on a 20, then rolling a 20 won't instantly confirm the "vorpal" style kill because you'll need the second To Hit roll to confirm. If you're already hitting on a 2+, then you won't have to worry so much about failed confirmations on your 20's.
The text already says "confirmed vorpal hit", so "the chance" is not related to the risk of failing confirmation.