The Titan should be a beast. It is supposed to get a 5.0 litre Cummins V-8 turbo diesel making over 500 ft. lbs. of torque and 300 horsepower.
I had heard a couple of years ago Toyota was going to put some sort of diesel in their Tundra but it just never happened.
I would love a smaller truck with a four cylinder turbo diesel. In fact, after I hit the lottery, one of my projects was going to put a VW turbo diesel out of one of their cars into an older Toyota truck.