In reply to Mac.
No, they’re not obvious and are very good questions.

When there is a release of core, this includes the latest version of Gutenberg. However, to stay on top of the latest incremental GB updates, you can install the plugin and this will keep you “topped up” between core releases.

So, to answer your questions…

1. Yes
2. GB will drop back to whichever version was bundled in your current version of WP
3. Probably the next core release