To bring everything back around on the restroom scents thing, this is clearly a move to push more F&B sales. Think of it like walking by the Main Street Bakery before Starbucks took over. They would pipe out scents of baked goods to make your mind think of food and then get you to stop in and buy something. Same basic thing is applied here. Themed scents are piped out and they all seem to have a food and/or drink theme to them based on what i've read.
Makes the bathrooms smell better, tricks the mind and increases sales. All are positives for Universal and this will likely be a very inexpensive thing to implement.