Have you called CIC's call centre? For what it's worth, I don't think they send email conformations after DM. I got DM and I have not received any messages. I think it's pretty safe to assume that if they didn't request any missing documents, or send you an email challenging the validity of your relationship or asking for additional proof, that your DM means an approval.
When I called CIC to ask where they were mailing the letter, to make sure they had the right address, I asked about my DM and if I had been approved. He said he couldn't tell me one way or the other, because it hadn't been exactly finalized yet until they mail out the document (presumably CoPR!!!) but "let me just say that you have nothing to worry about!" !
Give em a ring and see what you can get out of em!