On May 3 2016, Microsoft released announcements in the “Future of Sharepoint” event that PowerApps will be available for development directly from to be introduced updated SharePoint lists later this year and PowerApps will also be available for development within the web browser.

Further information can be access here: https://powerapps.microsoft.com/en-us/blog/powerapps-and-sharepoint/ for the English version of the article.