I was looking at the release schedule for next year, and with Warcraft, Kung Fu Panda 3, Peregrine's House for Peculiars and a couple of other movies moving out of March, there is an almost clear 6 weeks of leadup to BvS.
Feb 12: Deadpool, Zoolander 2 and some random Valentine's Day flick. President's day weekend is notoriously frontloaded, all 3 of these movies will make half their money in the 4 day weekend
Feb 19: Race, Shut-In, Viral. Race will probably do "42" numbers at best, the other 2 don't matter much
Feb 26: Ben-Hur remake. Seriously?
March 4: Zootopia and London Has Fallen. I can see Zootopia opening to 50M or more, and London has fallen opening to 25M or so. This will probably be the only big opening week till Easter
March 11: A random Bad Robot sci-fi movie which takes place in a cellar and stars no one of note. I won't be surprised if Divergent 3 moves here
March 18: Allegiant and Monster Trucks. Allegiant is a series on a major downward trend, I think a 40M opening will probably be right for it, and Monster Trucks really looks doubtful to even make that date, but if it does, it wont open half as well as Home did this year because Zootopia was just 2 weeks before.
Even stretching back to January, no big openers are on the agenda this year unlike the good start 2015 had. Furious 7 was a shocking opening considering that it came on the heels of 4 consecutive weeks of 50M+ openers. For BvS, there is a good chance of a box office vacuum, especially since there is no movie targeting the male audience demo after Deadpool and Zoolander 2.
Completely up to WB marketing to make sure the marketing efforts peak just as the release comes up. There is a demo which hasn't had anything to watch, the family demo which last watched Zootopia and a younger female demo which won't be going to watch Greek Wedding 2. Push hard to make BvS a family night out option for Easter basically.