eBay user sneeze58 is selling a piece of Scott Kolins art which would have been the cover of Flash #13, which was canceled for Flashpoint. The seller explains:
I bought this piece at the 2011 Heroes Con directly from the artist, Scott Kolins. This issue was to have the origin of Reverse Flash by Geoff Johns and Kolins, but was canceled due to the schedule of DC’s Flashpoint. I believe this is the cover rough, I’m not sure if a final cover was done however.The art is on 11×17 bristol, and a larger image is shown below.
It’s still not clear whether the Professor Zoom-focused issue was scrapped completely or repurposed as the Flashpoint: Reverse-Flash one-shot.