So as they had stated before, Unlimited Cruise SP will NOT be a direct port. They plan to add new things like costumes and bosses, as seen in this screenshot...
Emperio Ivankov and Boa Hancock are confirmed bosses for Unlimited Cruise SP, though we don't know if they're just adding them as secret bosses to the islands, or just chucking them into Boss Rush Mode like Arlong and Kalgara.