It was shown throughout the first season of The Flash, that we have looked in on an alternate Earth since Season 1, as Reverse Flash had changed the timeline years ago.
However according to a new Entertainment Weekly Spoiler Room Edition, Executive Producer Andrew Kreisberg does not consider the current universe Earth 2 and that we will see Earth 2 very soon.
Is there anything you can tease about what happened to Barry on The Flash? — Jeremy
Well, it sounds like that singularity leads to a pretty familiar place. In speaking about the great care they took with making their version of time travel both easy to digest and complex enough to be exciting for the diehard fans in season 1, executive producer Andrew Kreisberg says, “We’re trying to do the same thing this year with Earth 2 and the concept of the multiverse and the concept of dopplegangers. We’ve been having a lot of fun with that and getting glimpses of Earth 2 probably sooner than people would’ve thought.”