My Mac has been downloading the update for about 2 weeks, now. One was 1.17GB and the other was 390MB. The patch notes from the PTR look like they transferred over, but I didn’t do a line by line comparison.
To my amazement, the patch installed and brought up the login screen with the new animation. I recorded it using Jing. It’s 180MB, but worth the wait until the end… you’ll see why!