I love the past series so I'm really excited about the news!
"Following the discovery of the animated Justice League poster from a month ago, now a new animated Justice League series is confirmed by Cartoon Network.
Cartoon Network Canada responded to a fan question on their Facebook page with (via toonzone.net): "We will be premiering a new Justice League series, but not likely until next Fall."
As noted by a forum poster, the Cartoon Network shows usually air later in Canada than in the U.S., so that would mean the new Justice League animated series - speculated to be titled "Justice League Action" - would debut at least in the Fall of 2016.
The last Justice League animated series aired back in 2006 with Justice League Unlimited, which is coming to Blu-Ray soon.
The news of the new Justice League animated series coincides with the launch of the DC movie universe including Batman Vs. Superman next March, Suicide Squad next August, followed by Wonder Woman and the Justice League Part 1 film."
Source: Cosmic Book News