It's not a bug, those characters will be now unlockable (only proctor can be unlocked for now)
You can see it in the patch notes for 0.6.5.2:
There is a thing I don't like too much a about that article. It says "Exanima has been developed to serve as a second source of funding [...]. Those who supported the project didn't take it very well [...]" I mean, to me Exanima felt like something that was necessary, it didn't bother me at all...
Development is almost always like this. Some annoying issues pop up when you least expected. So this delay, although a bit disappointing, is kind of "expected". I'm confident you'll fix these problems :)