User blog comment:CoolTrainerTerry/USA Today announces Spidey has a sister!/@comment-1687414-20130617165412/@comment-4652104-20130618184245

I have two theories:

1. Someone wrote a script for it as one of Spidey's adventures, but it was decided (and reasonably so) that it made little sense with Otto as Spider-Man. At the same time, someone though that it was too good not to publish and thus it takes place before #700

2. This story is somehow setting up Peter's return.