I am also concerned about the roughly 2 hour run time. Are we going to end up with another Ultimate Cut that ends being considered the more definitive version of the movie. That being said, BvS should have been trimmed down and had a more direct story focusing on Batman and Superman, instead of meandering and universe building. Maybe the 2 hour runtime is a blessing, but Justice League has more heroes and this movie should be used to build its universe because WB felt they needed to rush to the big team up movie before giving everyone an opportunity to shine in smaller features.
It is hard to be patient as fan dreaming about this movie when it has all this baggage attached.