Well...since this split release is happening to test the waters, I'll just give my two cents. Doesn't work.
This game, not only has a big ensemble cast, but also multiple paths for many of them. And the result of this split format, is a very short update for someone who just wants to follow their single playthrough in a new episode. Just release a full update whenever it's ready. When it comes to an audience, you can't take back what you have already given them. It always backfires. So if the audience is used to big meaty updates, that's the way to go.