On Monday, BMW became the first carmaker to reveal its new hybrid racing prototype built to the new LMDh rule set. It’s called the BMW M Hybrid V8, and it will race for the first time at next January’s Rolex 24 in Daytona.

Sports car racing is in the midst of a transition period as race organizers in the US and Europe adopt new rules for prototype race cars. Because we’re talking about sports car racing, and because there are two sets of organizers, it’s all a bit complicated.

The 24 Hours of Le Mans is organized by the French Automobile Club de l’Ouest, or ACO. Many of the cars that run in that race also compete in the World Endurance Championship, which is organized by the Federation Internationale de L’Automobile (or FIA). In the US, there’s the International Motor Sports Association (IMSA), which runs the WeatherTech championship.