Robrob,
Actually I received two letters at a same time, from Vegreville and from my local office(Edmonton).
One from Vegreville was exactly same as yours, and I was wondering about my second letter from my local office which I posted about an interview. I think you will receive your second letter from your local office sometime very soon.
In my second letter, they did not ask me any additional information to bring with me for the interview, so I am not sure whether I should prepare lots of pictures of my husband and me(and his family, friends etc...)which were taken after December 09 as proof of our genuine relationship.
Well... I guess better to be well prepared in any case...
MexicaTica,
My interview is on 21 of September... in a week!! I will do my best
Mint