I just got the same thing too! Nothing has changed on ECAS or GCKEY yet.So I just received an email. I guess I'm not so much "stuck" in Mississauga, as my wifes application is being processed there.
The pdf said: "This message is being sent to confirm that the Application for Permanent Residence for your relative(s) will be processed at CPC Mississauga."
I guess they aren't going to send it to Ottawa or anything, and just process it there?