Didn't see a thread for this, but apparently there was a pitch for a Nightwing animated series back in 09 by many of the people currently involved with the Legend of Korra series, like the art director and some of the producers. I think it was shelved because they decided to go with the Young Justice show instead, which I am a fan of, but I don't know. Regardless looking at the proposed character designs I am really disappointed this didn't happen. I like the designs for Dick and Raven and it looks like this could have been really interesting. Oh well.
Dick in normal clothes: http://fc03.deviantart.net/fs70/i/2012/184/7/0/nightwing_dick_grayson_by_blacksataguni-d55vpi4.jpg
Nightwing 1: http://fc08.deviantart.net/fs70/i/2012/184/8/8/nightwing_1_by_blacksataguni-d55vpqw.jpg
Nightwing 2: http://fc03.deviantart.net/fs70/i/2012/184/e/4/nightwing2_by_blacksataguni-d55vpvi.jpg
Raven in normal clothes: http://fc07.deviantart.net/fs70/i/2012/184/2/2/nightwing_raven_by_blacksataguni-d55vq4s.jpg