i don't know all the sources but i heard it several times but it of course might not be true.. one of the sources is wikipedia.org.. but this one i might have misunderstood.
"From early on, the Hurd was developed to use GNU Mach as the microkernel. This was a technical decision made by Richard Stallman, and one that he later saw as a mistake."
If the reality is how You pointed it out then i am much happier right away :).. even though i thought viengoos would bring newer drivers and support for various things that mach has not yed focused on.
I also wondered if GNU/Hurd had some plan for future as other project have or due to the fact that there is lot of work on bugs that might yet occur it doesnt..
I mean whether there are some points when next release is made... some main revision versions with TODO lists.. i hoped i could help searching for bugs maybe even fixing some of them when i learn more about how actual debain/hurd distro is constructed.