Full scale manufacture it is! GABTU's plans for 1941 order the Kirov factory to produce 500 KV-3s, 400 KV-1s, and 100 KV-2s. Those KV-3s are quite expensive, 40% more expensive than a KV-1.
Plans change, of course. In reality, the Kirov factory built 611 KV-1s, 204 KV-2s, and just one KV-3, if you count the T-150 as a KV-3.
Going through unfulfilled orders, another unbuilt tank pops up, the T-34M. The T-34M (factory designation A-43) was a modernized version of the T-34, with features that would be seen in Soviet medium tanks several years after, like torsion bars, a 5 man crew, a commander's cupola, a planetary gear transmission, and internal shock absorption.