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Hopefully and it appears likely! They were also mentioned in 15.2 and probably already shipped with that version, so if they announce them alongside the release of 15.3 it’s possible that the Airs will have a day 1 software update.

I’m not sure if Apple has the ability to update them to 15.3 “in the box” a la the new iPhones
 
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Doesn’t seem like it. The M2 and M3 Airs have nearly identical BTO delivery dates which suggests no change to supply chain.
 
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