Very soon, I already posted a test build for the new version on my Discord server, Still need to make some minor changes, render a few images and kill some bugs before that though.
Yeah, once I upload the update you have access to it. You might need to download the game again though, even if you use the itch app. That I'm not 100% certain of at this point, but before I release the update I'm gonna try to figure that out.
What I can say though, due to some major changes to the code and a couple of new features you're gonna have to start a new game, so old save will not work.