Excellent execution, Hasbro! "Hey collectors, get excited for the next TVC Haslab reveal... uh, actually, nevermind - we'll tell you later."
I'm guessing Nick is probably right that they changed their mind and wanted some kind of reveal in-person to fans at something like SDCC. That makes me think that whatever they picked, it is more impressive to see it in person and get a true sense of scope as opposed to just being able to rely on pics/fanstreams. (Mos Eisley Cantina playset?)
Or I guess it could be as simple as someone dropped the fragile 3D model and they need to print a new one.