Maplestory producer E3 interview with Crstyn Cox

I think it most likely will go:
1 - Class Revamp
2 - Crafting
3 - Future
4 - PvP
5 - ???

Because while, yes, the Ice Knight update was delayed for KMS, they also got Future Henesys/Ereve with the Crafting System (as opposed to PvP as you listed).

Ice Knight isn't a big enough addition to warrant a whole section to itself, as others have noted.
Makes more sense to break up Crafting and Future since they're both pretty huge additions.

I can almost promise that the future won't be split up from Crafting.