Will Batman be introduced in a Justice League movie

It has been rumored that Batman may be introduced/rebooted in the possibly upcoming live-action movie: The Justice League of America.

Rumor has it that The Batman reboot will come after the JL movie and this will make Batman part of the 'DC cinematic universe'.
I believe that DC will be taking the Marvel approach, where Marvel did solo films to lead up to the big team-up, but I believe that DC may just do this backwards.

Next Summers DC comics based movie will be The Man of Steel (Directed by Zack Synder and produced by Christopher Nolan) and will be the last DC based movie till 2015, which may be the release of the Justice League movie.