Jon, Valve released an update to Orangebox which broke more.
Then Valve fixed it, but not all of it.
Garry then released more updates to Gmod that broke more.
Combine that with the fact many who went to SVN after all the 'updates' to Gmod and Source found a few more minor broken things, and you get a longer than hoped for release.
Thanks for your patience. Due to the constant Gmod updates...we've about lost ours.