According to IESB.net the Justice League has officially been put on hold as predicted earlier this week.
IESB.net recieved a call from an Austrailan source close to pre-production of Justice League and declared that the film is on hold and all production has stopped.
It's reported that the crew member stated "the big meeting took place yesterday. They've decided on a one-week notice to all of the employees - this is a standard practice in Australian filmmaking as a courtesy when letting people go."
Then main reason for the hold is related to the Writer's Strike. The earliest that production would be expected to return is in June. The word is that Justice Leauge is just on hold indefinitely, but not cancelled.