There's a few things going on here. The total track replacement is interesting because you don't often see that on a Coaster that is this young. Best guess, they needed to support additional weight with the on board audio.
I still think The Hulk, Dragon Challenge and Rip Ride, Rock It don't belong in the Universal parks, but I certainly welcome this upgrade. It looks to be on par with the upgrade Disneyland did a few years ago to their Space Mountain, making that my favorite version of Space Mountain.