You don’t see PC-98 and VirtIO in one release announcement all that often. ;)
Got any links to the posts about those latest features that are only in nightly builds so far?
I would suggest reading the newsletters from their “all news” page.
This version (0.4.14) was branched early 2020, and couldn’t be released until now due to some really pesky regressions that took a lot of effort to fix.
Thus, there’s a good year and a half of extra work in the trunk.