Single post in Shiny / Albino rate update
Forum Index > Core > Announcements > News Archive > Shiny / Albino rate update >
The long chain bonus, at the very least, applies to current chains.
(eg: Your 3,700+ chain is granting a Long Chain Bonus of 55.5% for hatching Melanistic Pokémon!)
I would assume the other changes are applied to current chains too.