Internally, Samsung is testing Android 7 Nougat on a bunch of Galaxy Phones already, the S7 and S7 edge are among them. A new report from China suggests that the Grace UX and some of the Note 7 features might make it to the Galaxy S7 with Android 7
http://www.notebookcheck.net/Will-Samsung-Galaxy-S7-users-get-their-hands-on-the-Note-7-GUI-with-Android-7.177476.0.html