I interviewed for both UMDNJs as well, and havn't heard back yet. I emailed Dr. Cohen at UMDNJ-Stratford/Camden last week, and both he and Lisa Cote are out of office until next week, so I don't expect to hear back until then, at least.
I also contacted Pam Boyle at UMDNJ-Newark, and she said most decision letters went out last week. Some didn't though, due to storms and lack of staff recently, and will go out soon. I hope this means they will be mailed this week. I asked whether I should infer anything form the fact that I was receiving a hard copy letter, and she said "no, [they] mail all responses". Good luck!