I received that notice too!
The acknowledgment saying we received your application 2 adults and 2 children (family). I went online to check the status with the client ID in the notice.
1. Received your application for cdn citizenship on march 17, 2014.
2. We sent you a letter acknowledging receipt of your application and a study book on march 17, 2014.
3. We started processing your application March 20, 2014.
I am new to this, is this pretty common? I see some people wait up to 2 months for ecas updates? The AOR did say we will review you app and will contact you if there is anything we need.
Thanks for your input!