Does anybody know when the next championship tournament 9x9 will start? The last one ended on April the first. That is nearly four months ago.

The last group finished just two days ago. http://littlegolem.net/jsp/tournament/tournament.jsp?trnid=fir.ch.39.2.1

and  championship 40 started yesterday.

Yes, approximately 1 hour after my first reply, it seems.