Id assume that the 7700X is basically the 1:1 successor for the 5800X and the reserved the 7800X name for the X3D equipped version that presumably comes later.

Id assume that the 7700X is basically the 1:1 successor for the 5800X and the reserved the 7800X name for the X3D equipped version that presumably comes later. They might release a 7700 without the X.