My first thoughts on looking at these pictures is everyone who was worried about TSL opening on time probably has nothing to worry about. I don't think there will be much in the way of previews, but I also don't think there will be much need for previews. SDD is a fairly standard coaster mechanism. Sure the double launch is cool, but not exactly revolutionary and can be dialed in with weight dummies. AS2 isn't a new ride system, no need to figure out how people are going to react to it or sit on it like FOP. TSMM is getting a new entrance, not exactly a big "test" issue. So that just leaves the restaurant. Disney opens QS restaurants all the time, it hardly requires 2 or 3 weeks of previews.
Looking at these pics and the progress, the land will open just as expected, maybe a week or 10 days tops of media and special previews, if that. It's just not needed. Now whether Disney wants to make AP and DVC types feel special with previews is a different question, but I just don't think they'll need to do it to make sure the land and attractions work as expected.