On August 31, 2011, it was announced that Jeff Segal was testing a Ferrari F458 at the infield road course of Homestead-Miami Speedway in preparation for the 2012 season. Segal's Grand Am career dates back to 2003, with Ferrari as his primary choice of manufacturer.
On October 26, 2011, it was announced that AIM Autosport would be fielding a new Ferrari 458 Italia in the 2012 season.
On November 22, 2011, it was announced that three-time series champion Andy Lally would return to Grand-Am competition full time, joining John Potter in the Magnus Racing Porsche 911 GT3 Cup for the full 2012 GT schedule.
On December 3, 2011, it was announced that Racers Edge Motorsports will be switching from the Mazda RX8 to the Dodge Viper.
On December 3, 2011, it was announced that two teams will field a Ford Mustang in the Rolex 24 at Daytona. The former Mustang team TPN Racing/BlackForest will return with the car alongside the Rick Ware Racing, which switched from a Porsche GT3 last year.
On May 13, 2011, Grand Am announced that various changes would be made to the Daytona Prototypes for the 2012 season:
The greenhouse (cockpit) area will be nearly identical for all newly constructed cars. The roll cage will be narrower on each side of the car, although the driver's position will not change. There will be a one-inch zone throughout the greenhouse surface to allow for individual styling cues, including windshield implementation and window outlines.
New minimum body cross-section provisions will give the new DPs a more upright front fascia and nose, rather than the more sloped layout of today's cars. This will allow manufacturers to add more design character to their cars, making them closer to their production cars while still offering the dramatic message embodied by a prototype.
Flexibility has also been introduced into the rules for side bodywork, including production-derived sidepods and open vents behind the front wheels that will enable styling elements from street cars to be functional on the race cars.
The 2012 season marks the start of a three-race "endurance championship" featuring the 24 Hours of Daytona, the Six Hours of Watkins Glen, and the new race at Indianapolis. In Daytona, there are points in 6, 12, 18 and 24 hours. In Watkins Glen 3 and 6 with double points, and quadruple points in Indianapolis at the end of the race.