Oh no you misunderstand - I agree that it will be far larger than TTK, but it will still function as an expansion. It will run off the same engine, you'll have all the exact same year one content on your director, you'll bring everything you have across etc - it will just be a whole bunch of new director locations essentially, with new additional weapons and armour, new LL cap, and some minor changes to existing locations (e.g. taken removed, replaced with some new world events)