I just wanted to add our information to this thread.
We were called to Ottawa on July 29th, 2014. My spouse had to take the Citizenship Test and got 100%. I didn't have to take it as I had just turned 55 but had to present my documents and have a mini interview with an agent.
Having read different postings on various forums, there doesn't seem to be a pattern for when people get their invitation to take the oath after passing the test.
Before the test everyone was informed that they should hear about taking the oath within 1-3 months. The only thing to me that seems to be consistent is that once you get the letter you have 2-3 weeks before you actually take the oath.
Our timeline is....
Application Received Feb 4th, 2013
Started Processing April 9th, 2013
Citizenship Test / Verification of ID July 29th, 2014
Now we just have to sit and wait to hear something. I check the ecas on a daily basis. Wouldn't it be nice though if their system could send you and email when your file was updated.