Riddick wasn't real, the guy does have a heart.
The Fast And Furious movies have been going on for a long time. A long enough time and with enough movies having been made that the people in those movies have become close. The death of Paul Walker has no doubt hit a number of them pretty hard, and here we can see Vin Diesel at an advanced screening of the new movie talking a bit about how hard it's hit him. It's plainly still quite difficult for him to talk about, but it's also kind of nice to see that the friendships in the movies are genuine.
Whether his predictions about it being the best movie are true is something you'll have to judge for yourself, but we're sure you'll probably find it entertaining.