User blog comment:Master Sima Yi/Assassinews 05-08-'14 – Assassin's Creed: Rogue announced/@comment-24849873-20141103090808/@comment-3046679-20141103125214

Unless they're withholding music on purpose in those gameplay videos.

I'm still hoping when they meant Unity running on rebuilt Anvil engine, they mean the original one that AC1 through Revelations ran on. The one that didn't need triggers for the ambient music.