Well I sent a message via the wesbite questioning if any letters had gone out, and this was their reply:
"HSF will notify all those applicants who will be receiving an award by no later than next week. Those applicants who were not selected in the first round of selection will be notified by the end of August regarding whether they were selected in the second round or not. Please wait for HSF to contact you regarding the status of your application, as ALL applicants will be contacted either way."
Hope this helps!