The ACT just announced that is has rescheduled its April 4th test for June 13th. Students registered for April 4th should expect to receive an email about rescheduling for the ACT in the next few days. The ACT does not have any information online at this point about adding more test dates.
The College Board has not yet cancelled the June 6th SAT. In an effort to be flexible the College Board plans to, "provide future additional SAT testing opportunities for students as soon as possible in place of cancelled administrations." So.....we shall keep our fingers crossed for make up dates.