First of these cars/engines to start this trend (to my knowledge anyways), is the Cadillac CT6. It was announced it would come with an optional 3.0L Twin-Turbo V6 and have a peak output of ~400HP.
Next to arrive, is the recently revealed refresh of the Lincoln MKZ. It’s slated to come with a performance trim, equipped with a 3.0L Twin-Turbo V6 making ~400HP.
And last, but certainly not least, we have the also refreshed Infiniti Q50 (and the Q60 coupe as well). It’s announced it will have a couple new engine choices, but one of them just happens to be - you guessed it - a 3.0L Twin-Turbo V6 making ~400HP.