http://talk.collegeconfidential.com/princeton-university/2108527-princeton-fall-2019-transfer-thread-p1.html
Check out the transfer thread from last year, apparently only 1/13 of the transfers was from a four year university (they try to accept CC transfers and vets). It also looks like many decisions were sent out May 7th and they all received an email about a week before that with a date, so just check your emails for updates!