The manufacturers have reacted well to the new regulations. As we know, the new Chevrolet Cruze has already hit the track, while BMW has announced the development of the new 1.6 turbo engine. By the way, RML and Chevrolet have signed a deal for three more years, so this is a long-term project.
As for SEAT, all the diesel-powered cars will be transformed and equipped with the new engine. The only cars that might might still have the two liter engine at the first race next year will be the Chevrolets of Bamboo Engineering, they will use the Cruze. They should be able to use the 1.6 liter Chevrolet engine from the European events on