In the Pokemon direct this morning the latest DLC for Pokemon Scarlet and Pokemon Violet was revealed. Someone pointed out that everything revealed in the DLC sounds like a leak from a few days ago and you can see by checking the link above, they were pretty spot on... a mysterious Pokemon with a green mask, clothes as a purchase bonus, large blue turtle, etc. Even the title "Hidden Treasure of Area Zero" was spot on.
Now what does this have to do with the Nintendo Switch? It says: We are working on a graphics enhancement patch for the new Nintendo Switch models that will be released alongside DLC2.
Now if this is true, part 2 of the DLC is slated to release Winter 2023.
As a side disclaimer, DLC2 might not actually be referring to "Hidden Treasure of Area Zero Part 2" but rather an additional set of DLC referred to as "Hexagon" (unless they got confused since the third legendary has a lot of Hexagons) in 2024.