Glad to hear you enjoyed your time with the game so far^^
The content for the next update is already set: It will implement Rare Enemies, Rework the Enemy Book to be more useful, add one new main transformation as well as serveral bug fixes and adjustments.
As for the release date. It is already out on patreon. There will be a free public release later on as well. But currently I don't know then it will be.