from the application submission time (the last date for any sort of proofs {email/photos/chats/call logs, etc}) to the date of your file being opened for initial view (about 9-12 months avg as it is now a days) you should pick a time frame that's just short of that initial review of your file... so say you sent in your file to cic-miss in MAR '12 and your file got transferred in June '12... it will be most likely opened for review in Mar/Apr '13, so you want to voluntarily send them additional proof to show that your marriage is still on going and genuine... hence sometime in January you should collect all the additional proof from MAR '12 - JAN '13 along with a voluntarily RE-PCC and all the applicant's forums to be updated minus the questionnaire (that should remain same as it was about how you initially met and got married) along with a cover letter that again describes your on going relationship.
so to sum it up....
send...
- cover letter entailing and detailing your on going relationship and what you are updating them with and the fact that you are sending this stuff voluntarily so that this helps expediting your case and saves some time (in a NICE tone).
= also you could write in cover letter that for eg. wife will remain housewife... etc...
- APPLICANT's forms ONLY + supplementary forms (send these even if nothing really got updated + they are mainly looking here for if any international travel occurred or not, if your spouse changed works, education, basically their history to be updated for the time in between...
- relationship proofs... this is photos, emails, chats, call logs, social media transactions, banking/financial, etc... from the day you sent your application package to the current date...
- updated police clearance certificate...
- any thing case specific that may help your case
* you cannot do remed voluntarily, only if and when requested by them (as they send you a form for it)...
if you are lucky and covered all your bases (sent all and complete info), they could
1. ask you again for additional info as they see fit --> very low chances but you never know
1a. put you in interview queue --> this will only happen if they suspect your marriage is not genuine or the background checks don't look clean... the case is likely to go the full distance 26 months...
2. send you a remed --> only if they open your file after 15 months of your original medical date
3. send you a ppr --> what should happen if you sent everything and correctly
4. send you a remed + ppr --> not a bad scenario either...
not trying to scare you... just putting things in perspective here
hope it helped...