Indeed. Given that neither the F80 M3 nor the F82 M4 have actually been officially announced (the M4 we saw was just a "concept"), it's a bit too early to get a solid answer to your question.
Wait until the official unveilings of the Production versions. Then it might be easier to get an answer.
As GOLFFRR said, some dealers are taking names of interested clients down, but that's as far as it can get.