These days, World Best can be defined many different ways. It can just be a good marketing angle, or it can be something really special.
You don't need to blow your wad for something to be world best. Kraken is a perfect example - take a standard attraction model, and stretch it further than anyone else ever has - and you have longest, tallest, fastest all wrapped up.
I would like to see VRTP drop a bundle on something really special, but MW has long craved an assortment of well themed flats to round out the park, and in my experience, most movie parks don't do this, as flats are not the best to theme to the movie experience and most people are looking for just that - the movie experience. Even USH and USS are mostly E-ticket attractions, supported by less than a handful of smaller flats.
Although this opinion is likely unpopular - i'd like to see them go with several well done flats to thicken the parks lineup - TailSpin is a good example of the kind of thing they should be looking for (although i'm not suggesting they buy an Air Race - two parks with near identical attractions would be just a waste).
Whilst it's definitely possible that this new attraction will be a flat, i'm confident we'll see a blockbuster... the park is well overdue, and it needs something else to pull people back after the publicity that GL received. I only hope that whatever it is - its a capacity monster. The park cannot suffer another addition without greatly improving either its capacity or its operations.