Okay, the "Identify your ..." pages are up for the new models, and there is one surprise that undermines our assumptions here in this thread. The base M4 Mac mini appears to be Mac16,15... It's not clear which is which of the two Mac mini identifiers, but it is confirmed they are Mac16,15 and Mac16,10 (listed in that order, so I've followed that below):
M4
Mac16,1 :: M4 120 (10/10) MacBook Pro 14"
Mac16,2 :: M4 120 (8/8) iMac (Two ports)
Mac16,3 :: M4 120 (10/10) iMac (Four ports)
Mac16,6 :: M4 Pro 273 (12/16, 14/20) MacBook Pro 14"
Mac16,8 :: M4 Max 410 (14/32), 546 (16/40) MacBook Pro 14"
Mac16,7 :: M4 Pro 273 (12/16, 14/20) MacBook Pro 16"
Mac16,5 :: M4 Max 410 (14/32), 546 (16/40) MacBook Pro 16"
Mac16,9 ::
Mac16,10 :: M4 Pro 273 (12/16, 14/20) Mac mini
Mac16,11 ::
Mac16,12 ::
Mac16,13 ::
Mac16,15 :: M4 120 (10/10) Mac mini
I'd say that high number means all bets are off. There are now four of the original M4 list unaccounted for, and there could be a Mac16,14, which would leave five M4 identifiers unaccounted for. M4 MacBook Airs seem more than likely, and it looks like M4 really could be the first Mac silicon generation where every current model gets the goods.
As for M5 and Mac17,1 and Mac17,2, it's likely something new. Whether it makes it into production is another question.