Did they learn nothing from the last crossover? They've ruined the CWverse as far as I'm concerned. What do they possibly hope to do here, and who do they possibly hope to include?
My only thoughts are Diggle as a Lantern showing up. That's legitimately the only angle that would have me remotely excited for this news.
Whatever happens, and however they do it, I can only hope, pray even that it's not the Flash writers who will be writing for these episodes, cause those guys need to move back into writing children's books or something.