Based on the placement list it indicates you should contact the office if you haven't heard by May 6th so I am assuming letters have started going out? This is the language from the website...
Placement letters have started to go out and wait list letters will go out at the end of April. If you have not heard anything about your placement status by May 6th, you can send an email to pasbt @pgcps.org
http://gis.pgcps.org/lotterylookup/
Has anyone received wait list info?