Two Universes
What’s interesting is that DC is not going the Marvel route and combining its TV and movie properties in the same universe. From looking at just the Legends of Tomorrow trailer, you can see that DC is bringing characters from its Earth 2 universe on to the TV. Shows like Supergirl (2015-16), Black Birds (2015-16), Gotham (2014), Arrow (2013) and The Flash (2014) are not connected to the movies in any way.
https://www.youtube.com/watch?v=4MubNoWQiSc