I would find it very, very odd if the Wiltern show was just like any of the other H&S or casino shows. I mean, if Stevie wanted to just play her standard set somewhere, a) she would have booked a larger/more conventional setting, e.g., Greek Theatre, Universal Ampitheatre, Santa Barbara Bowl, etc. and b) it would have simply popped up on Ticketmaster like any other show. No fanfare. Not only is this an extraordinarily intimate setting on an extraordinary day, it is being billed as a "celebration" of sorts, and it was very heavily promoted via her Warner Brothers site. Something is up. Honestly, she could have performed this type of show or series of shows anywhere in the country. But there is a reason why she chose NYC or LA- the industry. Given the ticket prices and the capacity, I certainly do not think she is doing this for the money- the total gross is probably less than half of her customary take. If anything, after overhead, salaries and comps, I suspect she will either break even or even be somewhat in the red. There is another reason for doing this...
All I can say is... be prepared to be surprised.
(I know nothing specific... it's just a gut feeling.)