Facebook are testing video ads with sound on autoplay.
It looks like at this stage, it will be a settings option - do you want sound on or off on your videos? Rather than the current 'mute' by default.
It's being driven by Advertiser needs and currently, a number sub-title (caption) their videos which is not, eh, great. Really.
It's also a reaction to Snapchat video ads with sound on.
Good news. Streamabout.com
