Not a peep on them, although GM did say they wouldn't be available on the 22s... but they're not even showing up as optional but on restriction or limited availability for the 23s. Maybe a mid to late MY23 availability?
Being the optional bronze aluminum wheels appear to look exactly the same as the early pics of the magnesium wheels (minus the Mg lettering just behind the spokes) I'm wondering if GM didn't give up on the magnesium wheels entirely for reasons of cost or availability, even though they do offer a weight advantage over the aluminum wheels.
On a semi-related note, as of MY23 GM is now offering optional bronze center caps for the bronze aluminum wheels instead of only the black center caps that came on the bronze wheels in MY22. The bronze center caps are currently on restriction, but they will be an option.