The current Vettes have rather amazing handling, especially the Grand Sport, which is only one rung up the ladder. Where they look cheap is with the switches and interior finishes.
The midengine should help handling even further. The polar moment of inertia will be lower. They may have a rearward center of gravity, which can produce tricky handling, but they can dial that out with computers now (Porsche). The base C8 Corvettes will have somewhere around 460 hp apparently, folks are guessing, which is what the current engine produces.
It interesting that the Chevy engines of this type still use pushrods, though the C8 top engine is rumored to be twin cam (DOHC). The pushrod design is easier to package because it is not as tall.