Cool! I'm always up for the Arrow/Flash universe expanding. And it'll be great to have Routh as (presumably) the lead, since he steals every scene he's in anyway.
With the news Caity Lotz is also appearing, I'm thinking it's pretty much a sure thing that her character Sara gets resurrected somehow, though likely in a Lazarus Pit (since it's pretty much confirmed those will be showing up in future episodes of Arrow).
Interesting that Wentworth Miller will reprise his role as Captain Cold... perhaps as a regular villain, or possibly a case of ARGUS getting their hands on him and implanting a remote bomb in his head, requiring him to act as they dictate (Suicide Squad style).
And Victor Garber appearing likely also means Robbie Amell will also appear so they can become Firestorm.
Could definitely see it as a likely possibility a live action version of Vixen will appear on the show as well.
They also mention 3 major DC characters who haven't appeared on live action TV will also debut on the series. Could it be the Big 3 of Superman, Batman, and Wonder Woman? Probably not. Perhaps Green Lantern, Cyborg, or other notable members of the JL?
I like that DC has the separate movie and TV universes (though I prefer Marvel's all-inclusive approach).
Looking forward to this. Guess we'll have to wait until around Summer until we hear more about it.