Amizaur and I are considering adding the St. Petersberg to a verision of our mod.
That is a greatly improved version of the Kilo Imp with standard Russian weapons like on the Akula. I believe that is what you are refering to. I don't know much about it, it was Amizaur that brought it to my attention.
I should add that it would either have to non-playable or be armed with the Kilo weapons because we can't change any of the weapon assignments for human controlled platforms nor can we add a new playable platform of its own, per the requests of SCS and hardcoded limitations in the engine vis-a-vis modders/modding.
It's for these reasons that we haven't done it yet. :hmm: