In the ramp up to Man of Steel, much of the hype has been focused on how much of a role the film will have to play on kickstarting the inevitable shared cinematic DC Universe. While WB president Jeff Robinov has confirmed this will indeed be the case in a recent interview, it seems to me that no matter how you slice it, the studio is going to be playing catch-up to Marvel at this point.
There’s nothing wrong with that – franchises are a long form game, anyway – but WB can make up a lot of lost ground and even get ahead of the curve in some respects with one simple connection. Man of Steel’s Metropolis and Arrow’s Starling City should occupy the same universe.
From: http://www.ign.com/articles/2013/04/20/hero-worship-could-there-already-be-a-shared-dc-universe