User blog comment:Vardion17/Supergirl is comming to The CW!/@comment-421074-20160512214521/@comment-421074-20160512222823

But Izombie and Lucifer are part of Vertigo, a sub-division of DC Comics. So, they can't be part of the same universe as Aroow, Flash, Constantine, Vixen and Legends of Tomorrow. However, Gotham could be part of the Arrowverse, but only 20 years before the start of Arrow.