Here's the trailer debut, courtesy of IGN:
THR has the full voice cast. Some highlights:
Jason O'Mara, the Terra Nova star who also plays George Washington on History's Sons of Liberty, is back as the voice as Batman. Stuart Allan, who appeared on TV's Bad Teacher, and Sean Maher, who played Shrapnel on CW's Arrow, are returning as Robin/Damian and Nightwing, respectively. Also coming back is David McCallum(NCIS), who portrays Alfred.