The kernel 6.12 cycle started a few weeks ago, and is already up to 6.12-rc3.
I do not know what is going on with the Ubuntu Mainline PPA, which seems to have stopped doing anything since about mid September.

Code:
doug@s19:~$ uname -a
Linux s19 6.12.0-rc3-stock #1278 SMP PREEMPT_DYNAMIC Wed Oct 16 07:46:47 PDT 2024 x86_64 x86_64 x86_64 GNU/Linux