Microsoft announced in January 2014 that InfoPath 2013 would be the last version of this product (http://bit.ly/1kfnAoa).
The October 2015 Product Terms confirms on page 6 that InfoPath 2013 will be included with licences for Office Professional Plus 2016.
InfoPath is at the end of its, er, path. Microsoft announce that InfoPath 2013 will be the last release of the desktop client and the InfoPath Forms Services in SharePoint Server 2013 is the last release of that technology. Both will be supported until 2023 and Microsoft expect to make announcements on the future of Office forms at the SharePoint Conference later this year. Read the full blog post here: http://bit.ly/1kfnAoa