So it's been about a week and from the PR activity I've seen, folks seem to have adopted the new PR template and release note process just fine.
Of course, folks chime in here if I've missed anything.
That said, I'd like to offer a suggestion:
If folks add kind label(s) to their PR that categories the nature of the change (feature, bug, api-change, etc.), then the updates to the release github action I'm working on can look for those labels to facilitate the sorting of the release notes.
I'll see if there is a way to enforce this use of a kind label on PRs, though I'm not confident,