The Flash Taunts Us with Hint of Supergirl Crossover

Since Supergirl first aired on CBS in 2015, fans have been hopeful for a crossover with popular CW shows Arrow and The Flash. At long last, DC Comics announced that Grant Gustin (a.k.a. CW's The Flash) would appear in a future episode of Supergirl.

On the 2/9/2016 episode of the Flash, fans got the concrete confirmation of the crossover they've been waiting for.

When Barry, Cisco, and Harry cross through the Speed Cannon from Earth to Earth 2, they are warned by Jay to ignore everything they see. When Cisco asks what they will see, Jay responds "Everything."

What did they see, exactly?

THIS!

First:


Second: 


AND FINALLY:




Anyone else excited?

And what about the recent episode of Arrow where Felicity was given the "Overwatch" code name? Oliver Queen/Green Arrow says: "I was going to go with Oracle....but it was taken." Taken by who? In comics Oracle is Barbara Gordon, the eyes and ears of the Justice League, but she hasn't been established in this universe yet. What does Oliver know that we don't?

And with the entire cast of the CW's new Legends of Tomorrow available, we are left to wonder:

How long will it be until the Justice League is officially established in the DC television universe?