I called yesterday afternoon and the person I spoke to said it was accidentally sent to all applicants and that it was not an indication of admission. I also received an email from Student Universe saying something along the same lines.
I asked when all decisions would be sent out and she said they were working on it and it would be a couple of weeks at the latest. I had the same theory about accepted students getting the email, because why on earth would Harvard give all of their applicants contact info to a travel agency before they were admitted?