Update 10th April: Andrew Kreisberg is denying that The Atom is the title of the spin-off.
Lots of rumors online about the title for @CW_TheFlash @CW_Arrow spinoff. I PROMISE they're wrong. We'll tell you soon #Arrow #TheFlash
— Andrew Kreisberg (@AJKreisberg) April 10, 2015
SpoilerTV has learned that the spin-off for The Flash and Arrow, which is currently in development at The CW, has tentatively been titled "The Atom". This title is not final and maybe be changed before the show goes into production.