As far as we can understand the current timelines for the expansion, 2024 should see the arrival of Star Wars in the park. Which will be a big thing as the Olympic Games will be in Paris that year. I don't see Disney choosing to miss a huge marketing opportunity to miss such an occasion to attract more guests.
However, this was all before the world got shutdown. With the current decisions of Disney to postpone the Tron and Guardians of the Galaxy expansions in Walt Disney World. Who knows what they have decided with Paris.