engine block

So, I have been trying my best with search but the term "UK" is just a bit generic. Apparently in the US you can pick up a used 302 block at most corner stores for a few hundred bucks, but clearly they are not as prolific in the UK as the US and harder to come by. While the new Ford Z460 crate...

I was watching Motor Week this morning on PBS and the Ford F-350 Super Duty pickup was featured. It was mentioned VERY QUICKLY that the new diesel engine has a carbon fiber (?) engine block. Does anyone know anything about this? Obviously, it would require sleeving, but IMHO the use of CF...