Starting for some in Beta 1 and with a wider rollout in Beta 2, Android 12 sports a fun new lockscreen on/off animation — or, depending on how you count, two slightly different animations. One expands out from the power button if you turn your phone on or off that way, and another expanding from the bottom of the display if you tap to wake or it times out on its own.
Trying to track down the provenance of this feature has been difficult. XDA spotted it in development back in Dev Preview 2, and at least one of us had it on a Pixel 5 as of Beta 1, but not all of us did — I didn't, anecdotally. Checking on my own Pixel 4 running Beta 1, the feature isn't present there, either. We have to assume it either varied in some manner by device, or it was just a bit buggy and didn't appear reliably for everyone, though it seems universally present in our testing on Beta 2, and it's definitely new in Android 12 overall.
