This 5.7-inch phablet that arrived in South Korea last year was mentioned in the list of Nougat-compatible Samsung handsets a while ago but did not receive the new firmware yet. Now, we see it surface on GFXBench with Android 7.0 on board, so the update should arrive soon.
https://www.notebookcheck.net/Samsung-Galaxy-A8-2016-spotted-with-Nougat-on-board.223584.0.html