Disney keeps throwing in so many qualifiers: "may take shape" "imagining" "possible" "potential" - they've been so wishy washy about this it's really tough to nail down their exact plans.
My entirely unqualified, uninformed and unwashed read on the situation is that Avatar was originally developed for the new land in Disneyland Forward, potentially even right where the concept art lines up - as was pointed out by an earlier post.
Based on insiders on these boards, it sounds like the latest thinking is that Hollywood Backlot + Bus Gateway space is the new destination, potentially because it wouldn't have to wait for the vote on Forward. If I am understanding it correctly, they are already zoned to turn the bus esplanade into theme park, but would ideally need the new permissions from Dland Forward to have a new place for the busses to go - is that right?
I think the Cars Land fit the theme well enough, there are beautiful red rocks in California just like we see in Cars:
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Red Rock Canyon State Park is super underrated btw ^
Plus, California was one of the vanguards of highway development back in the 1950s with the PCH and the advent of fast food places etc. so the theme was always close enough you could justify it if you were willing to be a little charitable (and squint)
Avenger's Campus + Mission Breakout in particular are a worse fit, with an eye-roll inducing justification but still "technically" could fit
Pandora for me feels like it crosses the line to the point it's basically just Disney "Adventures" as the theme, with California the location like Disneyland Paris. Very post-modern and I feel like I'm abstracting myself into knots but maybe they'll figure out a way to make it fit.....i just dont see one