I remember being pretty upset when this was first announced, but now, even having not seen the movie, I'm really excited about the night time possibilities this opens up to AK! Not to mention how beautiful the art suggests it will be!
On a different note, I do agree that this wasn't the best choice of expansion, and Disney's definitely letting the parks stagnate. After all, Epcot opened 11 years after MK, HS and TL 7 years after that, BB 6 after that, and AK 3 after that. It's been about 16 years since, if my mental math is correct, which makes this the longest WDW has gone without an expansion of that size.