The plan was to release a new ISO this month with the kernel at the linux 5.15 series. For that linux has been in the build repo for almost 2 weeks now at 5.15.10 & 11.
But there is a major issue with ISO creation, no ISO so far will boot with any 5.15 kernel, no errors, no logs, simply complete hang after the bootloader gives way to what should be the kernel loading.
Since a new ISO is really needed (and no answer found at all after 3 weeks of trying all kinds of ISO builds), there is no other choice but to move back to the 5.14 series. 5.14.21 is now up, so when on the [build] repo, run
pacman -Suu after you update and see the warning that the local kernel is newer then [build].