that he expects (not guaranteeing) that an announcement will come by or shortly before the end of this month; so look for an announcement likely just before or just after Memorial Day.
I have to say that I really respect the fact that he and his family are giving this decision the serious consideration it deserves. No teasing tweets, no attempt to portray the future of the western world as being at stake; rather just taking their time, evaluating
each school thoroughly and doing it in private. Actually a bit refreshing.