Notes:

Source: Derpibooru

I didn't make this, but with Meghan's recent tweet this whole thing is starting to make a little more sense. It's quite possible that the 2-part Season 4 opener will pick up after Twilight has been princess for a while, and the ultimate resolution of this storyline will be that she sheds her Princess title and Alicorn powers. No guarantees, but if Alicorn Twilight leaves you feeling upset, just remember that there's a lot more to this equation than "Twilight becomes an Alicorn princess, the end," and it's still quite possible that this is not permanant. The only downside is that we won't see the resolution until Season 4.