I'm just guessing, but I'm thinking that Patch 7 will be the last update before the game leaves Early Access, and that if they do decide to release more levels, it will be through that update.
I'm not sure if you're being very optimistic (you think it will be a relatively short time until full release) or very pessimistic (you think we'll only get 1 more patch in the next ~16 months). But in a recent interview Swen basically confirmed full release wouldn't be until 2023.
So it's more likely that we'll get ~3-4 additional patches before full release. Maybe one in January-March, one in late summer/early fall 2022, and then a final one in early 2023. Hopefully one of them will have level 5.
