The absence of Ray and Facilier does indeed seem very likely, though I wouldn’t be surprised if some sort of posthumous reference is made to one or both of them. Given the criticisms levelled at the fact that Tiana was non-human for most of the film, an avoidance of frog protagonists is, I feel, wise. As for the rest, I think it’s an exaggeration to say any of it is pretty certain. There is still potential for them to create something magical, even if the backstory they’ve laid out for us doesn’t exactly encourage such an expectation.