Samsung is working on a successor to the Galaxy Grand Prime from 2014. The upcoming Grand Prime (2016) has so far been benchmarked and spotted at the FCC as well as in an Indian import tracking database. So clearly it should be arriving soon. While we do know quite a few of its specs already thanks to that aforementioned benchmark run, today courtesy of Samsung itself we have some news about its software, since the company's published a user manual for the new Grand Prime already. It reveals the fact that this decidedly low-end device will come with Samsung's Grace UX on top of Android 6.0...
Source: http://www.gsmarena.com/galaxy_grand_prime_2016_will_ship_with_the_note7s_grace_ux_on_board-news-20900.php