Just hope it doesn't end up as lowest common denomiantor
I suspect most of the main Linux distros will apply any simple fixes - small patches that don't require e.g. any new APIs - within a 24-48 hour time span. Ditto the principal BSD forks - Free, Net, and Open. On the other hand I can see minority or niche Linux distros and the minor BSD sub-forks taking weeks or months to get around to pushing out a fix. I suspect it will be quite similar for many commercial platforms who will simply roll it into the monthly patches.
Co-ordinated roll out has its merits but not at any cost. Even if a fix is applied to the software I am using before the end of the embargo I'd be reluctant to apply it without at least some indication of what it addresses. It's difficult to evaluate its necessity or desirability without at least some background.