A number of rumors have come out pertaining to the Justice League movie, Latino-Review has posted that the film will be shot back to back with Batman V Superman and has a release date of May 5, 2017. It is also rumored to use the New 52 roster from the comics.
Also Cosmic Book News via Nikki Finke has posted a movie line-up that includes a Green Lantern/Flash team-up film among others it also states Ryan Renyolds won't return as Green Lantern. Below is the rumored movie line-up. Another note is that Batman V Superman was delayed due to casting of the other members of the Justice League so they could make sure they were all set before filming and signed to long term contracts.
Many of these rumors are supposedly set to be announced at SDCC in July.
May 2016 – Batman v Superman
July 2016 – Shazam
Xmas 2016 – Sandman
May 2017 – Justice League
July 2017 – Wonder Woman
Xmas 2017 – Flash and Green Lantern team-up
May 2018 – Man Of Steel 2