The first piece of concept art presented at D23 2022 did show live action characters mixed with animated ones. Plus there is a strong chance AID will be adaptable to whatever is current in the MCU.
Some in the Disney fandom do indeed think that the Hyperion will go for a 5th Avengers Campus attraction and that X-Men and F4 will be prime candidates.
There has been speculation on the IU forums that the studio tour load/unload could move, allowing them to expand the Simpsons replacement into that spot.
Sounds like the EGW will break ground once the 2026 DLR RunDisney event is over. Then once the 70th wraps in August/September 2026 they hit the ground running on Avatar.
Here's hoping the same level of quality and care trickles down into the post EU additions to IOA and USF. USF needs to be what they need to focus on next though. EU can wait a while for new stuff.