The folks at RankRanger posted on Twitter that they are seeing less Featured Snippets show up on Google mobile search, while more Direct Answers are showing up. They shared a chart from their mobile SERP trackers:
The desktop version shows very little change with direct answers or featured snippets, while Mozcast's desktop tool does show an increase.
I have not seen the SEO community talking much about this, so this is going just by tool data. I didn't build the tool, so it is hard for me to say exactly how it works.
But if Google is showing more direct answers on mobile versus featured snippets, that means your web sites are getting less play on mobile search and voice answers.
Forum discussion at Twitter.