Greenville-Spartanburg is always Top 3 for viewership, if not routinely the top viewer area (for those that aren't familiar with that area, it's the upstate portion of South Carolina, wedged against Tennessee and North Carolina), bringing tracks in that region back into the fold simply makes sense.
They tried to push into other markets, generally, that was a failure. Phoenix is decent, Auto Club had to completely reconfigure to even hope to stay in the game, Sonoma put up the carousel to make things interesting (although I personally like the track)... Chicagoland is dead, Kansas isn't looking great, Vegas has kind of turned into a joke with the low HP package....
So they are coming back into the southeast... but I don't think for one second they learned anything noteworthy from the past 15+ years.