What I think the expansion will end up being, and what I posted on Parkscope, is:
1) Amber Mine Coaster on Thunder Falls plot. The area here is similar to the area of Big Thunder Mountain in the MK, so I expect a somewhat similar ride experience. This will be a critical step forward for IoA adding some "everyone" rides.
2) "Springfield" in the Triceratops Encounter plot. Now, obviously I don't mean Springfield exactly, but I see this area becoming something similar. Food trucks, placemaking and theming, and 2 flat rides to increase the attraction count. IMO the flat rides will be something we haven't seen in either park rather than repeats.
3) General Island placemaking. JP has some problems, especially by the River Adventure. They need to get rid of the timeshare guys and the hair braiding and fix the feel of Jurassic Park.