BUT Dr.Nitschke stated in an interview (with bimmerpost I think?) that all single number M-models would have the same number following the M as the models their bodystyle is coming from.
So F82 = 4er Coupe based = M4
Nothing else is making really sense if they wants to sell the 4er as an "more premium" car. And for the Iconic/myth M3 they bring the F80M3.