I think this rumored Discovery Class will be about the size of Celebrity's Edge Class. But even with that, it might still be the end of sailing from Baltimore and Tampa. I wonder if Royal thinks they'll just accommodate those cruisers in Cape Liberty and Miami, PE, and PC, respectively. I do hope the new class will be small enough for the Panama Canal and Vancouver, which seems more doable than Baltimore and Tampa.
I just can't imagine them going any smaller than Edge Class. Because the smaller you go, the further you sacrifice the amenities and features that define Royal's brand.