Operation Charnwood
Caen
A map set throughout northern Caen, focusing on urban house-to-house combat. IMO, every Second World War FPS needs at least one urban combat map, as maps in the Second World War genre tend to be more open. Caen would be the perfect setting . . . bomb craters, close quarters combat, rooftop snipers, rubble-covered streets; it'd have to be realistic, of course, but seeing how beautifully Merville turned out, I doubt you'll have a problem.
Operation Deadstick
Pegasus bridge
A Pegasus bridge map, composed of the bridge and the surrounding area. I don't need to elaborate on this one. I'd love to have a bridge map, with a few bunkers, machine gun nests, and pillboxes; with the surrounding area, you'd have châteaux, open fields, woods, that kind of thing.
Operation Neptune
Gold beach
No Normandy setting would be complete without a beach landing map. A beach landing map should be set on Gold beach, with the beach, the shorefront, and the coastal communities. The details are important, but challenging; for example, you'd need to include the Allied fleet a few miles offshore, the sounds of the bombardment, stuff like that. Challenging, but very possible. If you have fears about the aspect of a full-on beach landing map, take a look at the beach landing maps in Forgotten Hope 2, they've done a great job with them.
If possible, maps should have a mode where the Germans are on defense and the British are on offense, and where the British are on defense and the Germans are on offense. Such could be the case with a Pegasus bridge map, for example, where in one mode, the Germans hold the bridge while the British must capture it, and in another, the British hold the bridge while the Germans must recapture it. Such could be true for some maps, but not others, such as Gold beach.
Just my two cents. I'd rather the game be released sooner, though, so maybe the second chapter will be the one to bring more maps? If you can't make a map accurate like you did with Merville, I wouldn't make it.