There have been 0.1 and 0.2 releases of both the GNU Hurd and GNU in the
mid 90s, no futher releases have been made except for a couple of
development snapshots of the GNU system done by ams around end-2005
beginning of 2006. While the GNU system development seems to have
slowed down somewhat over the last year (and was totally dormant between
mid-90s and mid-00s), development on the GNU Hurd (and GNU Mach and of
course GNU libc) is being continued. That development is independent of
the GNU system though, and is being discussed/coordinated at
address@hidden and not on this list. Debian GNU/Hurd is also actively
developped and discussed/coordinated at address@hidden
No proper release of Debian GNU/Hurd exists until today, but more or
less stable snapshots together with an installer are made available as
ISO images from time to time.
To get back to your question; neither GNU Hurd nor GNU/Hurd are
abandoned projects, but the latter is currently less visibly developped
(I am no insider, so cannot comment on any private hacking going on
behind the curtains).