While Barry Allen is still appearing on two episodes of Arrow, namely episodes 8 and 9, scheduled for December 4, 2013 and December 11, 2013, Grant Gustin's man-who-will-become The Flash will no longer be back for a backdoor pilot late in season two. Instead, The Flash will have a full standalone pilot of his own, according to Deadline.
The move is reportedly seen as a positive sign for The Flash to receive a series order from The CW, spinning out of the successful Arrow. The latter series has been rapidly introducing elements from the DC Comics universe it is based upon, with heroes and villains alike from throughout joining Oliver Queen on the small screen.
Geoff Johns, DC Entertainment's Chief Creative Officer, writer for Arrow and longtime writer of the comic book version of The Flash will write the new standalone pilot with Arrow co-creators Greg Berlanti and Andrew Kreisberg. David Nutter, who directed the Arrow pilot, will direct The Flash as well.
A standalone pilot comes about reportedly because of the positive reception from within the studios for the December Arrow two-parter introducing Gustin as Barry Allen. While a backdoor pilot would have to serve the character of Oliver Queen and the ongoing story of Arrow, a standalone allows the focus to be put solely on Barry Allen and his new supporting cast of characters.
The downside for fans is that we'll no longer get to see The Flash's debut in his own Central City locale this spring, instead having to wait for the (hopefully) fall debuting series.