Seems confirmed that all 2024 processors released by AMD will start with an 8. If you want to know which tech: 8x40 is Zen 4 (just like last year's 7x40), 8x45 is Zen 4+ (just like last year's 7x45), and 8x50 is the brand-new Zen 5.
As I have noted a number of times, the most important number in AMD processors (starting with a 7 and on) is now the 3rd number, which tells you how old the tech in the processor is. Some processors, such as the Ryzen 3 7320 and the Ryzen 5 7520U, are Zen 2 processors based on tech from 2020.
See here for details on current processors on the market:
https://forums.dansdeals.com/index.php?topic=132600.msg2817223#msg2817223