The GME Inline 6-cylinder Turbo is the replacement for the "regular" V8s. But, things aren't so bad for the big engines: if more of the main product line shifts to the smaller, lighter I6, that gives the company more leeway under the CAFE limits to sell big-output V8 models to enthusiasts. It's a win-win: if you want the big V8, it'll be easier to buy one, but for most people who really just want the power and would like better economy too, the smaller engine is hard to argue against - especially with hybrid assistance.