Not sure if this has been mentioned elsewhere but looking at Charlie Perks' recent POV of the ride, the Pressure Test music is now back in the Rub-A-Dub Reactor room!
EDIT: Also the original version of the Fairground music has been restored (so no more jumping back to the start of the loop...or quacking!!!)...but strangely in the Foamburst Falls section the Bubblehead in the barrel can be heard saying "It's out of this world!" like when the Craterade rocket was there in the Professor Burp days.