Keep an eye on the weekly update for news of all upcoming and current developments. When the rollout to 12 is planned there will surely be a notification and probably a list of devices in the order that they will recive the upgrades. Just like previous version upgrades.
Expecting a delay here as recently a couple of developers left the team for their higher studies in the US. Two new team member has been added but there will be a learning process which will delay these releases.
I updated my Oneplus 5 to /e/ OS 1.5.1 S (Android 12) the day before yesterday. Before that I did a factory reset in TWRP and formatted the data partition. (I am radical when changing major versions).
Runs great! Haven’t encountered a single problem yet. Many thanks to LineageOS, LineageOS for MicroG and Murena Team!!
I have a Xiaomi mi mix 2 (chiron).
Previous version was Android 11 R 1.14 (there is no stable version 12 S).
And all is stable. My smartphone is old, but battery is OK