It has been reported on Twitter by many and gloated over by the anonymous dweebs opposing this work. No further notice has been seen yet. This is likely a cartooney that Dr Beall is taking very seriously – we hope the interruption is temporary only. In the meantime, the Internet Archive has snapshots of the site before the recent events, most recently from Dec 30, 2016.
We wish Dr Beall all the best and for the service to be restored as soon as possible.