The Glenfiddich 21yr Old Gran Reserva Rum Cask Finish is now being sold at Binny's in Chicago. Instead of saying from Cuban rum casks it says, "finished in casks from a famous Caribbean rum producing nation." Cheers!
I've talked with Ian Millar of Glenfiddich about this a couple of times...they had to find casks that would match the taste of the Cuban rum casks, and finally found a source...I believe it's in the Dominican Republic. While they're bottling both versions for now, he suggested that they'll probably pick one and stick with that in the future, and it will probably be the US-legal version since that has more sales potential. If you have the chance, it might be worth sticking a couple of Cuban bottles in the back of your liquor cabinet for the future.