Speculating about the potential release date appears to be useless at this point with Affleck saying that he is not worried about meeting a predetermined date. Instead, he seems more than okay with taking his time to get the movie right. This could mean a long production and post-production, but what it will hopefully mean when everything is said and done is a Batman movie hitting theaters sometime in 2018.
Depending on when The Flash begins filming, The Batman could be the next DCEU film to enter production. WB had previously hoped to release three DC films in 2018, so it will be interesting to see how both films fit into the 2018 calendar – as only Aquaman has a confirmed 2018 release right now. Regardless of when it comes out, Affleck does not seem worried about the process so far, so neither should fans. If he can make a 2018 release work, that’d be welcomed by all; but if not, it’ll be better to wait a little while longer for a great solo Batman film instead of rushing to make a mediocre-to-poor version.