You'd think HRRR would be easy to update the song list too considering Universal has a successful music label, but they don't do that. For example, you'd think Pharrell's song "Happy" would be a no-brainer considering it's relationship with Despicable Me, which neighbors HRRR.
The truth is, a lot of people think just because these companies (UOR/Comcast, Disney Parks/TWDC) should be able to integrate things like this a lot easier. However, Uni Parks and NBC television are two completely separate divisions. They do have a decent working relationship, but it does make it hard as there's a wall that has to be broken through to even get the ball rolling.
But as said before, he could've already filmed enough to have multiple ride profiles at the rides launch. However, considering Uni hasn't said anything that would lead me to believe that, i'm not holding my breath on that one. I'll see when the ride opens.
Comcast let Universal music Group to get the deal approved for merger. Vivendi owns UMG not Comcast so makes sense why it's so hard. However The parks and NBCUniversal share the same leadership chain which is why certain things like TWD and other stuff Universal doesn't own they get permission from. I.E the EP for the Walking Dead who owns majority of the show rights also has 5 shows in production for Universal hints why we see TWD in the park. Same thing which why the TV and film are also 100% separate you see crossovers.