Awesome! This is from the first article:
The AMA series will support World Superbike, making the event a four-day happening. The AMA races will be run using the full course as opposed to the 3.08-mile outside course the World Superbike stars will run and the course the two AMA events have utilized to this point.
There are two reasons for the change. The first is commercial. World Superbike, like MotoGP, has signage regulations. The track and AMA advertising will go in the infield section not used for the World SUperbike events.
There's also the matter of comparing lap times with the machines. The World Superbikes, using Pirelli 'control tires', understandably don't want to potentially be outpaced by AMA Superbikes on Dunlops.
The US factory team folks we talked to weren't too thrilled to be racing the full 4.485-mile course, since two years' worth of testing and racing data is down the tubes. But such is life.