Earlier leaks had suggested that Vivo would refresh its Nex 3 flagship phone with a Snapdragon 865- and 5G-equipped variant. Now, the OEM has validated them in a new Weibo post. This new version of the device will launch on March 10, 2020.
https://www.notebookcheck.net/The-Vivo-Nex-3S-5G-s-existence-is-confirmed-in-a-new-official-leak.456013.0.html