Howdy,
It seems upstream has moved again, now to https://repo.or.cz/alpine.git
That's not a new home, that's just where the git repository lives. The current home is still http://alpine.x10host.com/alpine/
There is active development there from Eduadro, including two tagged releases since what's in Debian currently (though from the numbering and the contents of the pine.hlp file in the repo, these may be intended as rc/pre-releases).
Yes, as you can see on the release[1] page[2], Debian has the current released version and the only available releases are development builds. It looks like from the mailing list there will be a release later this month though[3].
[1]: http://alpine.x10host.com/alpine/release/ [2]: http://alpine.x10host.com/alpine/alpha/release/ [3]: http://mailman13.u.washington.edu/pipermail/alpine-info/2020-January/008717.html
From a cursory examination of the log, I see several commits that look like they would fix open bugs in Debian.
There seems to be a few bugs that will be fixed, SNI support for one. If you have a list of bugs matched to the associated upstream changelog entries, I wouldn't mind having those though. :)
~Unit 193 Unit193 @ freenode Unit193 @ OFTC
