If an American company could do the math and develop a comparable engine, they would. Obviously they can't! They are too lazy!
It has been a fact since the 70's, if you want a quality car, buy Japanese! Looks like the big three can't fight them so they are joining them. Buy Toyota stock RIGHT NOW if you haven't. From the quality cars to the new "Old Navy" marketing, they are bringing the big three to their knees, for neglecting the U.S. by being fat, dumb, and lazy!
If GM does manufacture a car with this engine, I look at it as a plus; there will be a lot of crappy cars with very nice engines in the salvage yards very soon!