That is: the people's hoonmobile will get a 660cc Suzuki turbo triple out of various JDM kei mobiles.
First I was like WAT?
Then I went like OK.
Now I'm quite stoked.
Think about it: "add lightness" is the point of a Seven, and a kei engine is about as light as it gets. What's more, several decades of development have made these hyperactive sewing machines rather potent.
From a young Japanese person's perspective, big engines in proper cars are not happening because no parking spot and no money. Yet hormones and need for speed. Combine with a fine motorcycle engine tradition, and you have the incentive and the means for Japanese companies to turn their shopping cart motivators into little grenades. And being Japanese, they're unlikely to blow up in your face.
More on the Caterham website.