You may know already about the Fantasyland Expansion at the Magic Kingdom at Walt Disney World - if not, check out my coverage on the Fantasyland Expansion, and what to expect line-wise.
The grand opening of the Fantasyland Expansion isn't until December 6, but as of today, November 19, it is open in "preview phase." This means the land is open as of today! In a preview phase, any parts of it can be closed, but in general, it will be open!
This also means I will be very busy the next week or two. I am always trying to ensure that my customers avoid the lines and tour the Disney parks in the absolute optimal way. Whenever a new attraction opens, it affects the lines for the entire park. Now, with an entire new expansion opening, there will likely be significant changes to the way crowds flow.
I don't expect the first few days to be a good indicator of overall crowd flow for the future - lots of people are likely to rush to the new areas of the park. That will likely change as time passes, and eventually there will be a new "steady state" for crowd flow.
ntil I have more data, my best recommendation is to visit the expansion area relatively early - I expect it to be relatively crowded. The good news is that one of the two new attractions (Under the Sea) has a very high guest flowthrough and the other (Enchanted Tales with Belle) is appealing to a limited subset of guests.
I expect the biggest challenge to be dining at the amazing new Be Our Guest restaurant. If you want to eat dinner there any time soon, you're out of luck - dinner reservations are long gone. If you're heading to Disney World in six months, make your reservations now!
However, the restaurant will be a (fancier) quick-service location during lunch - that means you will be able to eat there without a reservation. As of now, I would recommend getting there as early as possible - I anticipate it being completely mobbed at noon!