I agree with CapnHook, I think "Spamalot" will be another show like "The Producers". It has a good (if not recognizable) cast, and it's a comedy, and all those Monty Python fans could prove to be a good audience for the show.
I also think "All Shook Up" will be a hit. Look at shows like "Mamma Mia" and "Movin' Out". I think "ASU" will be a tourist attraction, even if the crtics don't necessarily like it.
I'm still on the fence about "Brooklyn" and "Little Women". I think because "LW" is a very famous story where so many people know it, it has been adapted into numerous movies. I'm not sure how many people will flock to see it once again, even if it is the first time it's on Broadway as a musical. As for "Brooklyn", which as a pop-ish/R&B score (correct me if I'm wrong), it could be a big draw for the younger audience (i.e. "Rent"). It could also flop miserably because of comparisons people may make to shows such as "Rent".
As for "Dirty Rotten Scoundrels"...I think at first it could be a big hit for the familiar names in the cast but once they end their run, I doubt the show will remain running.
The revivals, well, we'll have to wait and see. I'm not sure how many people will be willing to see "La Cage Aux Falles" or "Sweet Charity" (I'm not sure Christina Applegate is that big of a name to pull in millions. She's not exactly Hugh Jackman.)
That's just what I think. I could be wrong. We'll have to wait and see.
A little swash, a bit of buckle - you'll love it more than bread.