This is just a rumor and take it for a grain of salt. I've heard this from two CMs that I know that they heard that TDA is looking to have DCA open for 24 hours for the relaunch. Now everything they have told me has not come 100% true, but thought I would pass it a long. Sounds more of just an idea being thrown around.
I could believe this because look how popular the Blue Sky Cellar has been since the change over to Cars Land. It has been hyped for three years now! DCA has been known as the over flow park and keeping open that long could make guests realize it could be an all day park. Also DCA will be closed on the 14th for the media which would give Disney better prep time. The downside is the disaster with the last 24 hour event and the toll it took on Anaheim and Disneyland.