Great news! Just hope there not photoetch nightmares and in the $200 price range that Trumpeters kits seem to be reaching for.
I think that their price politics depends on the concurrence they find on each product. T-90s can be found at €25 plus mailing in the same Chinese shops where JS-4 are priced €36, but the T-90 is more complex and detailed than the other one. I think that it is because they have the monopolium of JS-4, while tyhey have good concurrency for the T-90. Besides they expect to sell less JS-4 kits because it is scarcely known, and they have to cover the cost of the mould with a lower number of kits.
I expect the T-10 will cost as the JS-4 or even more.
Regards
Massimo