Carnival Cruise Line will get a third 133,500-ton Vista-class ship in late 2019. This comes after sister line, P&O Cruises Australia, scrapped plans for a new build because the Austrailian market hasn't experienced enough growth. That new build has now been deferred to Carnival Cruise Line.
Carnival Splendor will say goodbye to Carnival Cruise Line and transfer to sister cruise line P&O Cruises Australia at the end of 2019. That answers the question of why no Fun Ship 2.0 upgrades.