Yesterday I asked the german promoter of the concert, if the show will be rescheduled, and I got the answer, that they will announce new dates very soon. But they can only announce it, as soon the the government officially forbids concerts in June.
So that's a sure sign for me, that the complete tour will be pushed back to August/September or next year.
I don’t think there will be any concerts in August/September, especially not in football stadiums that hold 50.000 people. Next year seems way more likely, hopefully everything will be under control by then. At least they’re not canceling the tour.