One reliable source we have (which also has their own source from WG), disclosed some info regarding one of their tanks: The TKS Tankette. It will be a premium in the USSR tree. Why? Cause the Soviets used it too (captured from Eastern Poland). And Estonia purchased 6 of those tanks, a country which was annexed soon into the USSR. Those vehicles were used in the 1941 Defense of Kiev, and were mostly destroyed. One of the Soviet TKS tankettes remains in the Kubinka armor museum.
This is extremely sad… Especially for Polish readers. I know some of you would prefer to have it in the German tree…