I'm curious tho', developpers; would you pay for handful and easy to work with engine ?
Why pay for such engine when there's already Ren'Py, that is free, fully customizable, more powerful, and that proved, with the thousands games available just here, that even an idiot can use it to create a VN and a bit more ? And if really Ren'Py is still too complicated, then there's Twine, that is also free.
Not that this future VN engine is bad, difficult to tell with this limited preview. But to be effectively interesting, it need to add something. Visual Novel Maker did it with its WYSWYG approach, yet there's near to no games made with it on the scene.