Well too bad, unless Relic decided to add the M4A3E2 with the expansion too, it won't get into the game.
Which is a shame, the Jumbo helped us through the Ardennes,
which USF is based off of. It was liked so much that some tank crews took armour from destroyed Panzers and Shermans and welded it to their own Shermans to create make-shift Jumbos. Then the Pershing jumps in after the war is decided, does practically fuck-all, and becomes the savior of US Armour.
I don't like the addition of the Calliope either. Mobile artillery in CoH2 is fragile, the original faction's can be one-shotted by most AT. Even in WFA the artillery can be two-shotted. Now suddenly we want to have our artillery on a Medium Tank?
Another thing that bothers me, considering most US Rocket Artillery was mounted on Trucks, which
does fit the design of CoH2 mobile arty.