Here is my bet,
The dems, in continued dire straights, will keep forcing this issue, and it will rise to crescendo in late October as their rhetoric becomes vitriolic.
Then, with say 2-3 weeks to go (sufficient time for Romney/Ryan to use their actual message while dems attack the release, but not too early to allow the dems to do so and then pivot back), R/R will "give in" and release some, AND comparable records to what Obama hasn't, such as transcripts, etc, and will do so very publicly, and do a quick, "we are doing this so the other side will stop their complaining and maybe be adults and look at the REAL issue...the economy. Here is our plan, and our CV's and why we will be good at it...what is their plan and what in their past says they can (eg transcripts)"
It turns a defense into a huge offense, and would not only force the dems to attack (and not talk about actual issues) but flip the "transparency" argument (especially if they tied it in with sound bites about the most transparent administration linked with FF executive priviledge, etc) around.
Let's face it, the fact O is SO resistant to releasing any real facts about school, while everyone (media, sycophants) says he is SOOOOOO smart, means there is some dirt there.
Hell, throw in a super-clean-cut Romney/ryan vs, Obama the toker (and more) and you get a hell of an attack add...follow up with, "maybe that's why they don't want to debate real issues" and ZAP.
Just my bet..,who knows.