User blog comment:Master Sima Yi/Assassinews 14-07-'14 – Two new Assassin's Creed: Unity trailers/@comment-3046679-20140714185641/@comment-2142534-20140714215246

I saw an interview on Youtube in which a guy from Ubisoft was answering questions and playing the E3 Singleplayer Demo at the same time. At the point where Arno comes down from Notre Damme, the guy says something like "I just want to show you the interior of Notre Damme" and he turns around and enters through the front door. So yes, it is explorable in free roam, I think he even explicitly said it. Unfortunatly, I don't have a link to that interview.