A device with Redmi branding and the model number M1908C3IC has been certified by the Chinese telecomms authority TENAA. It is believed that this device will be called the 8 on launch. It has dual cameras and 3 RAM SKUs.
https://www.notebookcheck.net/Possible-Redmi-7-successor-appears-on-TENAA-and-in-real-life-images.431121.0.html