Looks like The Order x Assassin's Creed.I didn't say it in my previous post but I was thinking of that exactly. the setting and art style looked very similar to the order. i was even thinking that the similarity to the order might have been the primary reason the project was canceled. I can imagine the internet memes already making this comparison just after the game's announcement.
Im kind of surprised how polished this demo looks. Usually the cancelled projects we get to see dont look like this.
If you hadn't noticed, this is Forum 2.0
