They have sprues and an assembled kit on display on the news section of their site:
http://www.miniart-models.com/
Earlier pattern waffle tracks, exhaust guards with indentations and the interior! WOW!!!

This IS good news!

Some years ago, I mated a TAMIYA SU-122 Upper Hull to a DRAGON T-34 Lower Hull with good results- I added a set of FRIUL "Waffle" Tracks, ABER PE, RB MODELS metal Gun Barrel, some resin bits & pieces, PANZER ART T-34 Wheels/Tires, my own hand-wound Towing Cables, and my own hand-formed Grab Handles. I added a couple of WARRIORS Russian tank crew figures to bring my conversion to life. I was pleased with the results.

Now that MINIART is getting closer to getting their SU-122 out to the Hobby Shops' shelves, I'll be looking forward to obtaining one of these, and I'll hold off on building it until the aftermarket companies start bringing out PE sets and resin updates, depending on what I feel would be necessary to improve this new SU-122. Nevertheless, I'm sure that MINIART will do a beautiful job with this new kit. Put me down for one!

Here in Ukraine the kit is available for pre-order at 35 USD.

That sounds like a very good price considering all the interior detail they included in the kit,

Yes, the price is fair.
Here is the link:
http://www.stendmodels.com.ua/product/su-122-pervykh-vypuskov-nabor-s-intererom-135

wonder why dragon do not do SU-122.

This post belongs in the Armor Soviet section not figures.
Anyway it has full interior too ! Hurray!! SU-85 coming too . They are also releasing a T-54B.

Assembly started:
https://vk.com/album-101374690_232470120

Some more detail images of the vehicle here:
http://vk.com/wall-101374690_2549?z=album-87145263_233283634
and the SU-85 mod.1943 mid production sprues:
http://www.greenmats.club/topic/1968-miniart-су-85-мод-1943-год/
(don't forget to use full size ('полный размер' in bottom left corner)option)
Enjoy!