Honestly, it is not a big deal. Nobody is really looking and paying attention to this announcement, and nobody will truly care one way or another. So then why announce it...I dunno honestly, probably because Warner Bros movies wants to take some attention off of the big news of Captain America 3.
Warner Bros management has been pretty stupid for several years. They don't look at their products and IPs as a whole and instead look at each division as independent. DC comics, Television, Animation, and Movies...are all kinda run separate of each other, and they don't work well together. If they would get over themselves and realize they NEED to work well together, and stop this old mind set in media about Television vs. Movies and whatnot maybe they could actually make great movies and television. The only problem is the movie management would screw it up.
At least the Television side gets it. The Arrow and The Flash are going to be successful. Gotham not so much, and anything else brewing...I don't think so. However, if they can successfully get the Arrow and The Flash moving forward for a few seasons, and spin them off into a Justice Society show, or a Young Justice Show, then They can introduce new shows about other characters every 3 years or so and keep popularizing DC characters into the mainstream. Even the CW gets it...with allowing for shows that perform with lower ratings to complete their seasons and continue.