While I agree with Star Wars, I'm still waiting for Ant-Man (who's pseudo-confirmed), Scarlet Witch, Vision, Daredevil (who they sadly kinda outright denied due to the brutality in the series, which is IMO bull**** since most of the violence comes from the villains), Agent Coulson, and Quake. And Doctor Strange, but he's a virtual guarantee for 4.0, alongside Black Panther.
But yeah, I agree. It's mainly due to the Disney portion being much more expansive, but yet not cohesive. While Star Wars and Marvel can carry their own big themes, Disney's so diverse that it's harder to do, especially since 1.0 was basically Pixar Infinity, with the only non-Pixar playsets being Pirates of the Caribbean and The Lone Ranger (both Bruckheimer films). Since they basically said they're done with big themes, it's likely that 4.0 will add lots of missing classics (though a TV theme would be great, since there's a lot they can do: Kim Possible, Gravity Falls, Darkwing Duck, and American Dragon on the animated side, Agents of S.H.I.E.L.D., Daredevil, and Jessica Jones (Agent Carter might be out of place, but there's that too) for Marvel, and expanding on the Rebels characters for Star Wars while finally getting Hera in the game. And the Muppets.).