Hi, same here. I believe more offers will come as the program states somewhere in a doc that decisions will be sent out by the end of March, so there's still a chance. I didn't expect to receive my decision that early because my TOEFL waiver was rejected so my checklist was completed 20 days after the deadline. BTW I got the same email as well but don't think it indicates anything.
Also, out of curiosity, did u apply to the Knight Scholarship offered by Cornell Engineering? I wrote an extra essay to apply and I am suspecting that the scholarship review could delay their decisions. But I'm not sure