Oh hey! I heard about the 'swap out Eric Idle for Dreamfinder' rumors awhile back but didn't pay much mind to them. Keep an eye on this type of rumor because it's looking to be the most likely. Though it's important that the show scenes won't stay the same if this is the route they go.
The approach is looking to be 'Imagination 1 on SparkNotes' if they go that route. So the whole 'touch, taste, smell, etc labs' will be gone. There are SOME proposals that want to reinstall the missing track, some want to make it into an omnimover, Imagination has a lot of moving parts in regards to redevelopment, especially as the Figment film project gets further into development.
There is no route where you get Imagination 1 back 1:1, sorry. Also do not expect any of this to happen anytime soon, Your best case scenario is EPCOT 50 right now.
Did you know Imagination and Test Track were supposed to be updated for EPCOT 40? Yeah, some world ending thing happened.