Some of the 2021 list will carry over to 2022 (items yet to be released here) to be updated later, but one of the edits just done to the Kingdom list is the Core class waves.
Until the recent reveal of Hotrod, it had me wondering why we didn't have a 4th wave to be released with the Deluxe and Voyager waves... and now it looks like there was indeed a fourth wave, just no new figures in it.

According to Entertainment Earth, the waves had...
w1 - (new) 3 Optimus, 3 Rattrap, 2 Vertebreak
w2 - (new) 3 Megatron, 3 Starscream - (old) 1 Rattrap, 1 Vertebreak
w3 - (new) 3 Soundwave, 3 Dracodon - (old) 1 Optimus, 1 Starscream
w4 - (old) 2 Soundwave, 2 Dracodon, 2 Optimus, 2 Megatron
w5 - (new) 3 Hotrod, - (old) 3 Soundwave, 2 Rattrap

I'd have to check my photos to see if we got both wave 3 and 4 here, but it means that Soundwave could end up being the shelfwarmer if we get wave 5 Hotrod here, with so many units in the last three of the five waves.