Not sure how many Cast Members were in the park during this preview. Is it even close to the 15% threshold?
I am going to guess that it is not.
From previewing the wait times the past three days, the most popular attractions with the longest wait times have been Indiana Jones, Pirates of the Caribbean, Haunted Mansion, and to a lesser extent Snow White.
I expect Snow White and Splash Mountain to be busier when the park opens to regular guests.
So if you are in the park at opening, I would do Indiana Jones first, then Pirates, then Mansion, get on Splash Mountain before 1030am. If the wait time for for Splash Mountain is building, I would skip Mansion and do Splash Mountain first.
I expect Snow White to have a long line from opening + 2 hours, but start to dwindle down to 30 minutes or less as the day goes on.
Side Note: Rise of the Resistance seems to be selling out in seconds. Make sure you practice getting your boarding group before your visiting date.
At California Adventure the first attraction should be Racers then Soarin. With less attractions than DL, the DCA wait times tend to average 20-40 minutes.
ME