I thought The Great Hall was included in the most recent model that they showed during that meeting with the neighbors. I remember Chris saying he saw it as well.
Nope, no Great Hall. People have speculated that it was a possibility, but in terms of what's been seen or known from Universal, no Great Hall. I WOULD love it though, would be amazing and seems like such an obvious addition. Would be our version of Florida's Be Our Guest restaurant experience. Would've been amazing to dine in the huge hall and have it decorated for Christmas, have performances, and watch the enchanted ceiling.
But no, we're not getting it unfortunately :/
HOWEVER, I think I have a confirmation of something exclusive we'll have in Hollywood and NOT in Florida (anymore):
Zonkos Joke Shop.
Since Florida is gonna also have the much larger Weasley's Wizard Wheezes joke shop as part of Diagon Alley, Universal confirmed that Zonkos will close and Honeydukes will expand into that space.
Since we won't have Diagon Alley (for the long time being), I think it's safe to say that Japan and Hollywood will have an active Zonkos Joke Shop! So....I guess that's something
Also, i think it's safe to say that we'll have a much MUCH better locker system in place for Forbidden Journey that's not as awkward or troublesome like Florida's that was added last minute. That should be awesome, as I've heard horror stories about how many problems it causes.
One thing that I'm hoping for is an ever so slightly expanded Hippogriff ride. Since ours won't be a previous ride (Unicorn), I hope they'll make it ever so slightly different or longer, even if it's half a minute longer!