My application was approved yesterday, but I did get an email today saying my application was updated. Interestingly, they added dates to my background check completion and eligibility completion. However, the dates they put for both of those were Nov 16, 2018, which is not possible because I had three ADRs after that. Next to the approval date, it also says "check your messages for details", but there is no new message.No emails will be sent. You need to check your CIC account or call the hotline to know when the application has been approved. When they print your visa and send to the facility to return your passport, they update the status of your application to "Approved". If you don't have access to GCkey, then call them directly around 2/3 weeks after the passport has been delivered.
All of this leads me to believe they are just having issues with the new format of the online accounts, since it was changed fairly recently. They will probably sort it out over the next few weeks.