They have to catch up with the American and Japanese parks : (Winnie the Pooh ?), Beauty and the Beast, The Little Mermaid, The Incredibles and Monsters Inc. need a permanent place somewhere in the resort. Besides, they have to feature the Studios latest hits : Frozen, Rapunzel, COCO, Luca, Star Wars, Moana, Avatar and Marvel. That's what happens when you haven't invest properly in your parks for decades...
Once the WDS expansion complete, most of those new IPs will be home at DLP. They'll only have to find/build more elaborate experiences inspired by Cars, Star Wars and COCO and introduce, in the meantime, to the European audience : Avatar, The Incredibles, Monsters Inc., Moana in an immersive way.
For instance, they want Avatar to be part of the new 2025 parade and nighttime show of the WDSP and Moana is, so far, the IP that will replace Frozen in Animation Celebration. That may change if Wish proves to be successful though.