From the release:
Fall Weiss is the 1939 / 1940 supplement for Ostfront, that has been a year in the making. Covering the Invasion of Poland, the Battle of France and the forces involved. Fall Weiss includes complete army lists for the Polish Armed Forces, French Army, and lists for the early Wehrmacht, Soviet, and British Armies.
Fall Weiss contains a full campaign complete with map, 3 brand new scenarios - 1 depicting Dunkirk, and another for Westerplatte, as well as the extensive army lists, history and descriptions of each unit. Fall Weiss adds over 50 new units!
Ever wanted to field a Panzer III Ausf. A with 15mm of armor? Or perhaps a legion of 7TP Polish light tanks? Perhaps the BT-2 or BT-5 cavalry tanks are more your style? or perhaps the endless variants of British Cruiser tanks? From the Mk I all the way through to the Mk V, even including the Mk IIA CS version with the 94mm gun! Hell, you could even throw in a Daimler Dingo while you're at it! And don't forget the wz. 34 armored car...
All the French tanks and arms are covered, from the Hotchkiss H35 cavalry tank, to the Char D1, Char 2C, and Char B1 bis, and of course the ubiquitous Renault FT.
The field guns of the opening period are covered, from the short barrel infantry support guns like the LeIG 18 to the 76mm Soviet regimental gun. larger calibers include the Polish Wz.36 (a copy of the Bofors 37mm), the German 5cm PaK 36, British 2-pdr, and the French 75mm M1897 and 47mm APX field guns.