Spring 2024 newsletter contains actual Chapter 5 assets

The 5 flowers chosen exclude green and yellow, hinting that Green is the next secret boss soul color (came true)

Papyrus watering flowey
Susie and Kris watering dark-costume Ralsei (he is hiding his goat form from Asgore in the flower king dark world)

Asgore in his hawaiian shirt cutting bushes with Undyne

https://toby.fangamer.com/newsletters/spring24/

Actual chapter 5 assets are in this newsletter
Toby did it with Jackenstein's pumpkins.