Some more news.
Captain Cold, OMAC/Brother Eye, Black Canary and Doctor Fate possibility confirmed. Along with Green Lantern and Harley Quinn probably returning.
It's in the trailer. Here's the Brother Eye reference (pardon for the large images):
ATTACK IMMINENT/COMING 2017
GOTHAM CITY, EARTH
BASE OF OPERATIONS:
NOTES: EXCEPTIONAL MARTIAL ARTIST
EXCEPTIONAL TECHNOLOGYDEDUCTIVE SKILL
Cold's Gun is at 9-10 seconds in.
It clearly says stuff like "Leonard Snart" "Captain Cold" "Central City", etc.
As for Black Canary.
It was a pic of Katie Cassidy doing some mo-cap stuff on her Instagram/Twitter and she mentioned something about working with NRS on something. I think it was removed or at least edited. Here's the pic in question:
Doctor Fate, Harley Quinn and Green Lantern.
Don't know what that is.
Supposedly Harley's hammer
Doctor Fate's helmet
Captain Cold's gun
Green Lantern's well.....lantern