Hi I am also in the same situation and I'm not sure what happens next. Mine changed on 9th August. I started a thread yesterday as I see a few people have had that change in the last few days and are also wondering what to expect, I hope people who are in the same situation or have an idea of what happens can compare notes and we can maybe get some info. See the link below if you're interested.Review of Additonal Dcuments changed from We are reviewing the additional documents you provided to We do not need additonal documets.... I have been NA2 since July 4th... What usually happens after that chnage?
http://www.canadavisa.com/canada-immigration-discussion-board/threads/after-change-to-we-do-not-need-additional-documents-what-happens-next.512397/