DC's Legends of Tomorrow

This is the title of The Flash/Arrow spin off series and the official description is as follows:

"When heroes alone are not enough ... the world needs legends. Having seen the future, one he will desperately try to prevent from happening, time-traveling rogue Rip Hunter is tasked with assembling a disparate group of both heroes and villains to confront an unstoppable threat — one in which not only is the planet at stake, but all of time itself. Can this ragtag team defeat an immortal threat unlike anything they have ever known?"

Rumours are there maybe a special trailer sometime next week.

^^^
most likely during the season 3 finale of arrow next wednesday

Hence why i said next week.

Greg Berlanti (“The Flash,” “Supergirl,” “Arrow”) will serve as executive producer alongside Marc Guggenheim (Eli Stone, Percy Jackson: Sea of Monsters), Andrew Kreisberg (“The Flash,” “Warehouse 13″) and Sarah Schechter (“The Flash,” Pan).

Here's the first cast pic of show and it is Sara Lance but shes now White Canary

So is White Canary from another timeline/universe?

The character does exist in the DC Universe she was a chinese assassin but with the tv version of course they've changed that and used Sara Lance as White Canary, her firsr appearance in the comics was in 2010 in the Birds of Prey comic's funny enough Black Canary was in that comic too lol.

The First look trailer:

DC have killed it looks Flash and Arrow might be showing up, it explains how Sara Lance is back, Vandel Savage another big DC villain and there was even a before shot of The Reverse Flash and The Atom finally .

Oh yes!!! Gets a big thumbs up from me. Was most interested to see who caity lotz plays in this, since her character Sara Lance gets killed off in arrow. So fascinating that Sara Lance is being brought back from the dead and becoming white canary.

Wouldn't surprise me if Sara/white canary appears in arrow season 4 as a way of promoting legends of tomorrow