Yes, it's true - applications will be mailed out snail mail tomorrow, and by post only...here's from the Admissions Office:
"All admissions decisions will be sent via regular mail only on Friday, March 20th. Financial aid letters will be included as well. You are welcome to contact the Admissions Office approximately two weeks after March 20th if you have yet to receive an admissions letter.
For more information on the SAIS admissions process, please visit http://www.sais-jhu.edu/admissions.
Best regards,
SAIS Admissions"