The recently discovered memory-context-switch bug in 8.1's autovacuum
seems serious enough to force an update release for that branch, since
it could result in crashes in an installation that had been working fine
for a long while. Although this only affects 8.1, the core committee
has concluded that we might as well update the other back branches at
the same time. Accordingly, we're planning to wrap tarballs next
Thursday (1/29) for public announcement Monday 2/1. If you've got any
back-branch bug fixes sitting around, now would be a good time to send
them in...
regards, tom lane