User blog comment:Mr. Xemnas/PLANET HULK SET FOR 2015 WHAT!!!!!!!!!!!!!! AVENGERS 3WORLD WAR HULK?????/@comment-5473242-20130207024651/@comment-1895174-20130209035921

that means that the Justice League wasn't a way to show that they were all in a linked universe?

Well they weren't linked before it, so yes.