Flash: Rebirth artist Ethan Van Sciver has been answering questions over at the Green Lantern Corps Message Board, where he left this response to confusion about the length of Flash: Rebirth:
It was always going to be 5, but we’re probably going to add a 6th issue.
This actually would better explain the artist’s remarks that the series might not be done by September, but that it would be “a good thing.”
Thanks to SpeedsterSite for the link!
Update: Speedster Site has collected the Flash Q&A posts in one place.