Basically what DreamfinderGuy said. I just used the term "line" to make it easier to understand for myself and readers here.
It's not tooooo recent either, I've always had people telling me SSE was gonna be before Imagination. I still believe Imagination is coming after SSE is back online, but yeah they're likely still planning that out.
There's plans for Imagination being floated around like always, healthier budget than what I was told prior due to a miscommunication (backed up by others like good ol Martin!), and that's happening by EPCOT50. SSE is just being done prior in my eyes because that space is already having work done in it, and it hasn't been touched since 2007, may as well get it up to date!
Magic Eye is an interesting factor in all of this since that could very well "skip" Imagination the Ride. But now I'm just spit balling. But Imagination is an active topic and they're always talking about what to do with it. I know that's not the ideal outcome currently, but hey, it's not like they can hold it off forever.
If you ask me? SSE at Destination D23 next year. Closes by end of next year or early 2026.