Although its not ready to make any official announcements yet about a new powertrain for the next-generation midsize Frontier pickup truck, Nissan will unveil .\rbr\rbrNissan is renewing its commitment to the mid-size pickup segment, long a part of its sales success in the United States, with the creation of the Frontier Diesel .\rbr\rbrProject truck created to gauge consumer interest in a next-generation Frontier with a Cummins diesel engine - Concept builds upon Nissans long heritage in .\rbr\rbrAlthough its not ready to make any official announcements yet about a new powertrain for the next-generation midsize Frontier pickup truck, Nissan will unveil .