Well if the next pack is a regular pack then it will most likely be a scenery pack since the last pack was an animal pack.
This is just my own thinking of course and Frontier will do whatever Frontier is going to do and any theme is technically possible. But if it's a scenery pack, I can't see how it won't be either a Central America pack or a Woodlands/Boreal pack focusing on North America. Latin America would be too encompassing to not be an animal pack. If we do have more than just a finale type of DLC coming, I am 99% sure that one of the two would be something focusing on all or some of Latin America.
So if they keep to a scenery pack they can knock out 5 Central American animals which will also mostly have some South American representation, negating the need for a full Latin American animal pack. On the other hand, if they're planning a Latin American animal pack and intend to leave that for the summer, Woodlands/Boreal makes sense for the spring spot. It would give us some North American focus after last year had a total of 2 animals from it, the Peccary and the Wolverine. But...where would that leave animals like the Baboon, Secretary Bird, etc. Would they just not make it in at all (which is possible of course), or would Frontier actually be working on DLC for the rest of 2024?
So my thoughts on the next pack(s) (-- is not either/or, just the symbol for flowing to the next pack in order of what I think is likely.
A: Central America Scenery Pack -- Finale/Wrap Up/World Tour/Whatever you wanna call it.
B: Latin America animal pack -- Finale
C: Woodlands/Boreal scenery pack -- Latin America animal pack
D: Woodlands/Boreal scenery pack -- Latin America animal pack --- 1 or 2 more packs for 2024 including a Finale pack