The big update which contains campaign won't arrive until months to come. However, We will release small fixes and patches every fortnight if possible, so you at least can expect that.
They are using 1295 submod, which Building Pack personally released by Artstudio. We postpone the release of the Building Pack for the main MK 1212 because we want to refine it, avoiding too Warhammer-y fantasy buildings or glitchy buildings for the meantime. However, we may release it ourselves in the future.