The KV-1S will be split, becoming tier 5 and 6. What is the KV-1S in the game right now is actually only a KV-1S when stock, with the second turret it becomes the KV-85, with the 122mm gun, the KV-122. The stock KV-1S will become tier 5, and later possibly merge with the KV-1 when upgradable hulls are introduced. The KV-85 and KV-122 will be nerfed in mobility, but stay on tier 6. This change will happen in patch 9.3.