I am not sure, but I wouldn't think they would take the walls down. I know it said that all the major construction would be going on inside the caves, but I just don't think they would take all of them down. They might take some walls down, but they still have a ton of construction left for queues, and scenery....etc. So an educated guess from me would be...no. Not until they are getting really close to soft openings, or cast previews.
With all of the additions to the lagoon exterior I have a feeling they'll keep the walls up to keep things secret until they're ready to open.
Our revels now are ended. These our actors, As I foretold you, were all spirits and Are melted into air, into thin air: And, like the baseless fabric of this vision, The cloud-capp'd towers, the gorgeous palaces, The solemn temples, the great globe itself, Yea, all which it inherit, shall dissolve And, like this insubstantial pageant faded, Leave not a rack behind. We are such stuff As dreams are made on, and our little life Is rounded with a sleep. mycroft16 on Twitter
they will fill it with water so they can test all of the stuff and make sure it works underwater. It is a water ride the stuff has to work in it so the last push of the ride construction is to get the effects working with water in the ride.
Constructionland.... I love it. I'm going to have to agree with Sam seeing as once the ride is completed (effects and all) they will need to do testing and tweaking to the show. Although they could test at night, they will need to test the effects during the day also. So my guess (and it's only a guess) is that the walls will stay up close to its soft opening.
Stalking is when two people go for a long romantic walk together but only one of them knows about it.