4-Cylinder GM Diesel-Engined Trucks for GM by 2015?

According to Automotive News, GM is planning to equip the next-generation Chevrolet Colorado and GMC Canyon with a 4-cylinder diesel engine. These engines, the Duramax 2.5 and turbodiesel 2.8, will probably be offered approximately one year after the launch of the redesigned models, which is scheduled for autumn, 2014.