Here's a small overview I've come up w/ from testing, I haven't seen anywhere on the thread where it says in black and white what the patch does so here goes.
The AI:
cannot autoraze
cannot raze
can raze a civ in regicide when killing the king
does not abandon but this is true without the patch
The human:
cannot autoraze
can raze
can raze a civ in regicide
can abandon