announced on the HotT mailing list and reported on The Stronghold Rebuilt, the new version of Hordes of the Things is now available. If you're interested, this version codifies the Warband/Shooter movement swap that's been an unofficial rule for over a decade. It also has a whole lot of new army lists (as is missing some old ones due to intellectual property issues) and an optional movement system using base width as the unit of measurement.
Right now, it looks like the only source for this book is Amazon UK. It's a little pricey for me, thanks to international shipping, but sooner or later I will be purchasing a copy of the updated HotT rules.