I assume you picked that day because it is one month prior to official open? I hope maybe they shoot for a little earlier...my family will be there until May 11.Fanbois will be loitering in the area from May 13 til open
As for other soft openings, we were there March 12-15, 2017, and Jimmy Fallon was already open before the official opening date of April 6. At that time, it was pretty much final, except a small part of the waiting lobby upstairs was roped off and they were taking photos of it. I believe there were other waiting lobby adjustments being made as well.