I'm not sure if this has been discussed recently, but what about the land where Flashback once stood? I've checked it on Google Maps in the past and it's mostly dirt.. It could possibly fit Big Spin from SFDK? They could get that and Log Jammer's replacement in the same year.
I haven't been on much yet, so I really just should name the parks.
Cedar Point
Kings Island
Six Flags:
Magic Mountain
Great America
New England
Over Texas
Over Georgia
Canada's Wonderland
Dollywood
Carowinds
Kings Dominion
Vegas coasters
Lake Compounce (Boulder Dash)
Now for the ones that will probably never happen:
Alton Towers
Thorpe Park
Gardaland
Mirabilandia
Port Aventura
Fuji-Q
Nagashima Spaland
Basically any park that has something worth riding
Leviathan will definitely be different from the other Hypers. It has a gigantic turnaround element that is probably comparable more to MF than the Hammerheads on B&M hypers. Leviathan also has those two small hills that could give an impressive amount of airtime. Personally, I think the whole layout (NOT intensity) of this coaster is closer in relation to Millennium Force than other B&M Hypers like Behemoth and Nitro.
I think once we all see the completed lift hill and drop, we'll see what it's really about. I'm also excited to see how good (or bad..) the airtime on those two smaller drops will be. This'll either be a huge success of an airtime B&M giga machine, or a failure that feels no different from Behemoth.