Originally Posted by
christep
But you won't be able to use points to skip Y+, that's the point. If you want to use points to get into J then you'll have to buy Y+.
I suspect this may actually be the primary motivation - too many miles upgrades in J currently so this is a good way of cutting them back.
Not necessarily true. JL has Y+ but in order to upgrade to J using miles, you don't have to buy a Y+ ticket. In fact, upgrade from Y to J and Y+ to J costs the same amount of miles on JL.
As for the op-ups, if there's not enough elites in Y+ cabin, CX might just pick elites from the Y cabin to upgrade them to J.
All these depends on whether CX is treating Y+ as a completely different cabin or just a Y cabin with more room.