Whatever will be next I would love to see similar number of variants as we'll get with T-26.1)I would love to see "upgrade kit" to create
Polish 7TP tank based on Vickers E suspension and same front part of the hull (also the same as T-26). I think all parts you'll need should take no more then 1 sprue. Both variants: with 37mm Bofors gun and twin turret mg's.
2)Pz.I auf.B with Panzerjäger I, sIG 33 Bison and Kleiner Panzerbefehlswagen options. All of them had Pz.I auf.B body and different superstructure.
3)Because I'm Soviet biased:
Of course once T-26 goes live there is a BIG potential for another soviet kit with less work. Like
BT tanks.
BT-2 - will be nice but had different turret & wheels)
BT-5 - same turret as T-26 m1933.
BT-7 - really similar turret (or the same) as T-26 m1938
BT-7A - had T-28 turret with KT-28 gun. So once you made it you have 1 turret variant ready for T-28.
BT-42 - for BA Finland players
There was also BT-4 - same 2 turrets as T-26 m1931 but they stop after 3 prototypes. But hey! We already have turrets from T-26