The Galaxy M51 has appeared on a Samsung Russia support page ahead of its release. The device, which first leaked nearly five months ago, is rumoured to feature four cameras, a 6.5-inch display and upwards of a 7,000 mAh battery.
https://www.notebookcheck.net/Samsung-Galaxy-M51-Mid-range-handset-slated-for-a-6-5-inch-display-and-a-7-000-mAh-battery-appears-on-Samsung-Russia-support-page.485177.0.html