All likelihood all-new. The original kit had a plain underside (probably the reason they included an underside view

)and a different turret, road wheels and fenders. It also looks like the rear screen will be hollow unlike the ICM kits.
And yes, there's room for another T-34/85. So many production variants that no two kits need be quite the same and there were tens of thousands of the things with many still running around.
It's about time Zvezda took another stab at this iconic Soviet tank.