I hope they pull some of the elements/tech from the Tokyo show. I read that the head of WDW recently went to Paris and was impressed by some of the stage show elements. Hopefully they do the same with Tokyo and pull from their electrical parade.
Well, just wild guesses on my part: If it's DAK, then it may have been the code name for the nighttime safari. Or even for all the nighttime shows added to the park: RoL, ToL, nighttime rides and entertainment.
OR... It's a reference to Sunset Blvd in DHS. The last thing there was the Sunset Showcase flex theater. Or, it could be the rumored replacement of Beauty and the Beast or BatB's theater (to enclose it).