In an effort to get this thread back on track of talking about 12.1.2 instead of arguing over features that haven't been released yet...
I've already had an issue with this release.
I, too, got 12.1.2 last night. This morning, on my first drive, I got a "Cruise Unavailable" warning and thereafter neither TACC nor AP were available. The only time I've EVER had that before was when the front bumper was covered with snow and ice (a situation that Tesla apparently doesn't care enough to fix, other than some cryptic "put some hydrophobic coating somewhere on the car" tweets from Elon).
The conditions this morning were 60 degrees and a very light rain / mist. I cannot imagine how that would have caused an issue with the TACC.
Anyone else had this today?