The Americans have pretty much always pronounced it like that, or at least my sister-in-law does

Fiat brough a chunk of Chrysler primarily to get their hands on the American distribution net to get Alfa back there (a goal for some time) There has been a 500 MA engined show car for America, detailed in a thread entitled 'I feel cheated' or something like that. I would suspect though that they will be sold as a Fiat 500 Abarth rather than as a stand alone company as in the EU.
As he said all up in the air.