So now that the invitations are rolling out, more communications should be coming regarding any program changes (notwithstanding the apparently new 'you'll drink swill in the clubs and like it' rule).
I'm betting on 2 enhancements which I'm optimistic could be part of the 2019 program.
1) A mileage redemption program more similar to UA's GS program, where CK's can pull from a separate inventory bucket
2) More liberal SWU usage, again pulling from a different bucket than the current 'C' class
These changes would put CK much more on par with United GS. I have no actual intel that these will happen, but I do know from some discussions with knowledgeable people at AA that they have been considered, perhaps even 'strongly' considered.