Interesting. It seems that nothing much has really changed as far as unlocking of the lock screen--the full screen can still be used to unlock the phone, and still requires a swipe of only about 1/3 of the screen to actually unlock, like in earlier betas, so I wonder why/how the issue would get better now if at least the majority if not pretty much all of lock screen functionality as far as unlocking has remained (seemingly) the same.
I don't know how it was in the unlock-prone betas, but a couple of observations on how it works now. It only works with one point of contact so two finger slide doesn't work for example. The display will turn off after a time as normal, even as you're touching it if your touches don't unlock/show passcode screen, so no half-gestures keep it alive.