The hubsoft itself is good enough to test, and it's already being tested by a few at the moment. In FlexHub the hub and GUI are completely separate, that's why the GUI can control the hub remotely too.
But for broader tests the GUI needs to be closer to finished than it is now, too many hubsettings have to be set by changing the ini-files manually now. As soon as the GUI is almost ready for beta, we'll need some more testing to iron out last-minute bugs.
I know it's been a long wait: I hardly had time to do anything on it the past 6 months or so, but recently making some good progress on the GUI again. I promise i'll leave some bugs in for beta release, and hope it won't be too long anymore now.