It means that the repository was in a mess. They seem to have cleared out the whole lot, but some libraries have been rebuilt and put back in, so the rest will follow in time.
I don't imagine it'll be out for more than a few days, because:
a) The developers need people to test the builds and provide feedback.
b) Most users are technically incapable of building from source (which is only fair, and why there's a build repository in the first place).
c) The maintainers don't want to sit and listen to "but I can't get the latest version!" for longer than necessary.
I think the problem is that there are some fantastic new features promised for this release, so people are loathe to step back to 9.11. Of course, we're also gradually approaching a final release, so builds will probably be coming in quite steadily once they start up again.
So you have a choice. Either check back each day to see if new builds have appeared, or grab the source and compile your own.
Good luck!
Edit: Finally got my ATV running again after screwing my partition table. Going to allocate the rest of the internal drive for workspace to try building the current source. I'll update with the results if I manage to get it built.