I'd love to see an Intamin impulse coaster, preferably with twisted spikes (ala Wicked Twister) and a holding brake on the back spike. During Coastermania last year, WT was one of the surprises of the trip along with Raptor and Blue Streak. For just going bascially back and forth, the ride was great fun. Plus, these seem to be among Intamin's most problem-free rides of late.
That and the hyper would fill Carowinds biggest holes in the lineup. IF not an impulse, some kind of launch coaster is needed.
To me a floorless isn't that different from Vortex or Top Gun. I'd probably rather see something else to have more variety unless they did something really cool with the layout. I love B&M loopers but having a "Top Gun Jr." with a different riding position isn't as appealing as something truly different, although I could certainly live with one.
I'd bet on something like the impulse, or an Invertigo as the next coaster IF it's not the hyper. Something smaller like those would be pretty easy to shoehorn in somewhere and would provide a nice change of pace to what's already there.
KenB