I think a flyer or 4D coaster will come first.
I'd love a flyer, but if the layout some people have determined from the plans is accurate, it would be unlike any flyer layout over. Flying coasters don't tend to have an out and back layout. There is a first time for everything, though.
Speaking of guesses, I did a YouTube search to see if anyone made one in NoLimits and there was just one (at least for now).
Edit- Random thought: While looking at old aerial photos of HP, I remembered the park used to have a rapids ride. Would it be out of the realm of possibility to give the park a new one? Canyon River Rapids was removed for the second phase of the water park following the 2008 season. Most big theme parks have a rapids ride. Should HP have one (again)?
Some good points. Let me counter.
1. I don’t see definitely hyper layout in the plans that have been released, but I really don’t have any alternatives to suggest. I would remind everyone that the planing documents show the area of development by 2020 not a single ride or two.
2.I do think the out and loop back(part of the plans) is probably for a coaster holder but could be for infrastructure/ leveling.
3. Project 2020 has only been given zoning for 20-40% of the zoned area, so my bet is 2022-2030 for a new river raft ride.