SRPMs could presumably be made that would build binaries for both, which might simplify Texstar's job, but (unless Neal has already spoken for him) we'll have to wait to see what he wants contributed.
Packagers would presumably be expected to run and test on both platforms before submitting packages, whatever the system.
But I'm doing an awful lot of presuming. Maybe Neal knows, or maybe we need to wait till Texstar has a working system and then decides how package maintenance will work best.