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We were emailed that our preview time was to be rescheduled, with the preview time being given to us upon arrival at the hotel, and as a result of the rescheduling, our breakfast at the Leaky Cauldron may become either lunch or dinner.
I'd take HTF's word for it, it makes more sense from an operational standpoint to open without Express. There's also a pretty in-depth explanation of the entire ride over at the Orlando version of the informer, if you wanna check it out.