User blog comment:Master Sima Yi/Assassinews 14-07-'14 – Two new Assassin's Creed: Unity trailers/@comment-3046679-20140714185641/@comment-3046679-20140714224827

Neat. I doubt they'd make 12 entrances for the sake of a mission (because we all know there will be at least one set inside of it), so free roam is clearly planned for the interior there. Part of their "lots of interiors" angle.