It was exciting to see new FoSL during SP conference in Las Vegas last year. See this blog post where I have covered FoSL. It was scheduled to be released with SharePoint 2016 but looks like InfoPath is going to stay for some time in SharePoint future versions.
Although, I prefer customizing SharePoint forms using client-side technologies to InfoPath, it is definitely good news for existing applications which rely on InfoPath customization.
See this blog for more details.