I have the MBA M2, arrived last week, no problems with Dorico, although I have not had time to do much notation work yet. It behaves as expected, no crashes, it opens, plays, edits etc.
Remember to deactivate the license on your old Mac.
NotePerformer
Set Dorico to open using Rosetta if using NotePerformer.
I had silence when playing initially, I played around with the Playback settings, but didn’t want to think about it too much so simply installed NotePerformer again, and it all worked.
(Clarification: I set up the new MBA from my Time Machine backup from my previous MacBook so “everything” was transferred.)
There are some comments about CPU heat/throttling limiting performance as there are no fans, but I do not have large orchestrations to know if they are affected by this.
FYI