This answer:
Q: Might be too soon but I’m quite curious about how the contents in the future will be like after experiences from the Forbidden Land, Eureka.
Y: I’m very glad about how many adventurers are enjoying our contents that many members with Mr. Nakagawa’s lead helped making them. “Freely choosing your own adventure outside of FFXIV’s rules” kind of contents could be possible in the future. What new concept, new place, what could be fun aren’t something I haven’t brainstormed yet….Probably should start thinking right now.

This says to me no eureka styled content in early 5.x yet also says haven't looked at anything to break the mold either and personally i don't know which is worse