A new leak has confirmed that Lenovo is working on the Yoga 9 and Yoga Slim 9, which will both feature Intel Tiger Lake processors. The devices also support between 16-18 hours of battery life and up to 4K and 500 nit displays.
https://www.notebookcheck.net/Leak-confirms-new-Lenovo-Yoga-9-and-Yoga-Slim-9-with-lightweight-chassis-4K-displays-and-Intel-Tiger-Lake-processors.481573.0.html
I assume that this Yoga 9 is the clamshell Ideapad (S)9 series and the slim 9 is a new product altogether? The yoga slim 7 is equivalent to the US ideapad Slim/(S)7 series. This new naming scheme is confusion is my opinion
The naming convention of Lenovo laptops is confusing as hell.