User blog comment:DaNASCAT/Technical Update: January 20, 2016/@comment-452-20160123150027/@comment-1824272-20160125134724

The change in name makes complete sense. Remember a couple of updates ago, they added Videos to NewFiles and everyone went insane? The thing is, Videos are under the File: namespace too, so Special:NewFiles implies that Videos would be included there.

That being said, it's conflicting with audio files as you pointed out, so we'll see if they have a solution for that.