Not surprising that they do. He's a popular character and the demand is there. I'm interested in seeing Katana (who of course has been a member of Batman's Outsiders team). This is also the first CGI Batman animated series so that is going to be another interesting aspect of the series, not to mention who they will cast to voice the character.
I'm just surprised they keep canceling one series, only to give rise to another (usually set between movies). B:TAS from the 90s had a long run that wasn't restarted every time there was a new movie.
Then again, different times, etc.