If this rumor is true...
http://www.slashfilm.com/justice-league-reshoots-rumor/
As shitty as it sounds, I think they found a way to help Synder save face for stepping down as Director.
If the rumor is true, then Synder's Justice League wasn't what the execs at WB wanted.
If it was a good movie, it would be done by now, but
-They've had reshoots that has
"essentially remade the movie twice"
-They brought on Joss Whedon
-And there are more reshoots
WB needs this to be huge, and with Synder at the helm they were bleeding money. At the same time they need to meet there November release date. I'm not sure how much Whedon can salvage in that time, but things were obviously not working with Synder.
Time will tell if the reshoots for JL will give us Suicide Squad or Rogue One.