I haven't seen a release date but Zvezda is showing a preview of some of the upcoming "Battle for Moscow" Art of Tactic mini-sets on the Zvezda facebook page:
https://www.facebook.com/Zvezda.ModelKits
Also some of those listings on the Zvezda website have been update with figure and/or sprue pics:
6197 Soviet Infantry (winter uniform)
6198 Soviet Infantry (winter uniform)
6208 German 81-mm mortar with crew 1941-1945 (winter)
6209 German 81-mm mortar with crew 1941-1945 (winter)
6210 German MG-34 machine-gun with crew 1941-1945(winter)
http://www.zvezda.org.ru/?lng=1&nav=2&c=1
Finally, I saw this on TMP a few weeks ago, someone from a Russian miniatures site got to visit the Zvezda factory and they posted preview pics of the sets above:
http://miniatures.ru/events/1214-zvezda ... nyj-vpered
The new sets all look great, I prefer four figures for support weapons as opposed to the original Art of Tactic sets with two sprues of two figures, most wargame rules require three figures for support weapons.
Looks like the Soviet machine gun set (6220) is delayed as I haven't seen pics anywhere. Also no news on the Soviet 120mm set (6147) or the two sniper sets (6193 and 6194). I'm also disappointed that the German anti-tank rifle set (6182) seems to have disappeared, the Panzerbuchse 38 is so rare in 1/72 (Preiser set 72527 is impossible to find).