HBG is putting out a Renault FT-17 soon also, so they will probably have new colors. With all the colors HGB will do, there will be more customizing oportunities. Also, the Neutral artillery and trucks would fit in as WWI. Maybe Armored cars too? I’d love more guys with Adrian M15 helmets since half of Europe adopted it.
If the allied tank is the french FT-17, it will be really useful. It is considered the first modern tank. Thousands were made during WWI and they served throughout WWII and a bit beyond. Several minor powers, axis and allied, had them in use as well as France. Even Japan and the Philippines had purchased some in the inter war years. Germany captured over 1,700 after the fall of France and used them mostly there, seeing action at Dieppe and after D-Day. 4 were even found in Afghanistan in 2003 (though long retired).