Seriously, even AMD isn't saying what it is, just giving download links for calendar markers. Reputable sites are pointing to Lisa Su's remarks in her Barron's interview that it's going to be an official 7nm Vega reveal, but really what else could it be?
We will be “competitive in high-end graphics,” she said. “We’re making high-performing quality products and building a solid long-term foundation.”
No Navi or consumer level goodies, of course, but...
They revealed a lot, so check out the full story: https://wccftech.com/amd-zen-2-7nm-cpu-architecture-epyc-rome-and-ryzen-official/
MI50 and MI60 7nm graphics accelerators (Vega 7nm)