I think I covered some of my wishes in an earlier post, but to recap: a ne M4A3 for the Battle of the Bulge, a new M5A1 "Stuart", an M10 tank destroyer, some figures of the Army-Navy combined engineer groups (came ashore to blow up the obstacles on DDay and suffered heavy losses), a US 105mm howitzer w/ crew, and maybe a new, revised LCVP.
Your Cassino idea is interesting as the campaign ended up involving US troops, British troops from several Commonwealth nations, Free French "goumier" mountain troops, and Free Polish troops. For a company that specializes in figures, this Allied variety, plus the variations in German troops, would seem to call out for attention.
I know that (so far) Andy isn't into "repaints" of most of his vehicles, but an M10 tank destroyer could be offered with variable stowage, or whatever and offered in US (North Africa, Italy, Europe and even Pacific), British, or Free French colors and variations. The M7 "Priest" SP gun is another vehicle that got around in varius nations colors and in many campaigns of WW2.