War in the Pacific. Iwo Jima, Peleliu US Marines and Japanese Imperial Army. D-Day Oxford and Buckinghamshire Light Infantry and British 3rd Infantry Division.
Ditto for those -- lets get the Iwo Jima Marines right (in M1941 jackets). Definately the Ox and Bucks, along with Lord Lovat's Commandos.
Also:
US Airborne Jeep with the option for a trailer, Airborne 6 pounder, or 7rmm Pack Howitzer.
Some paratroopers with the "other" small arms -- M1919A6, M3 Grease Gun. Glider troop with a BAR.
ACW Confederate Artillery (The Washington Artillery of New Orleans, one of the oldest military units in the US, would be nice)
ACW "standard" Federal infantry in sack coats.
Battle of New Orleans (there are just so many different participants)
Korean War (pretty much ignored)
WWI 1916-1918, French in Adrian Helmets, Doughboys. 1 pounder trench guns, Chauchats A French 75. German Schusstruppen.
Boxer Rebellion
What about Bannockburn with a good personality figure of Robert the Bruce.
I still want a dismounted Henry V in the Agincourt series.
Vietnam Marines, Hue City. Mechanical mule mounting a 106mm RR.