Battle of Brest was already pulling the limit since Brest is located in Brittany, not in Normandy. But it was excused due to reason that the battle was part of an operation that was initiated in Normandy. Operation Market Garden however was nothing about normandy or france entire.
But I agree that Arnhem from 0.7 was a fun map and I'd love to see it again in FH2, but only historically accurate like Donutz originally dreamed about. Seriously tho, I doubt OMG will get a dedicated version for it like Africa and Normandy did. If anything, it'll be like Olympus, Crete and Sfakia, they are fillers that are included just because someone wanted to make one and was capable with the tools and materials that are currently present.
Who knows.