Brothers in Arms in focusing on Market Garden, not D-Day (that was covered in the first two games). Medal of Honor will have a number of airborne missions, all of which begin with you dropping behind enemy lines. Medal of Honor will probably be the most open ended FPS to date.
But I'd like to hit the beaches at Normandy too, but only if it is done right. I'm kind of sick of those doors opening and everyone just charging foward. People tend to forget that when you got out of your boat, you were part of a sqaud. You were being ordered around, or giving orders. It wasn't just a free for all up the beach, dodging MG42 fire and blowing up bunkers.