My understanding is that this is a bit of a myth. While certain attractions and exhibits need to be closed at certain times (or animals cycled out), there is no reason the park can't be open late. The only reason they've had it close earlier in the day is that it doesn't have enough content (attractions) to justify a longer operating day. They're adding a nighttime component to the safari, which may involve new lighting and cycling of animals. They're also adding a nighttime show somewhere in the park (presumably on the river near Everest). Personally, I'm very excited about all of this activity at DAK. It's my favorite park aesthetically, and now it will have even more for you to actually do. There's a lot of negativity about Avatar (and I REALLY hope this thread doesn't devolve into an anti-avatar rant, like most of the threads), but I think it's a brilliant choice for this park. It adds to the nighttime offerings - especially considering how beautiful it will be in the dark. Disney is all about place-making. Avatar is one of the most beautiful landscapes ever created in a movie. The plot is pretty much irrelevant in this case. The key to this whole expansion is creating a completely immersive experience for guests, and I think they'll do it.