The Redmi 9 just popped up on Xiaomi's global RF certification page, confirming that the phone exists and its model number - M2004J19G. This number was also spotted in a batch of devices that were recently certified by the 3C. These certifications don't reveal much. A related model, the M2004J19C, is listed at the 3C with a 10W charger, though that would be a weird downgrade - both the Redmi 8 and the cheaper 8A support 18W charging. Anyway, these will be 4G phones, which probably comes as no surprise. Previous leaks showed a photo of the quad camera on the back of the phone, which...
Source: https://www.gsmarena.com/redmi_9_listed_on_xiaomis_official_site_as_launch_nears-news-43100.php