There was a SiSoft Sandra leak, which was subsequently removed from the database, which detailed a potential AMD APU with a massive 28 CUs. That would give it 1,792 GCN cores, which is almost on par with the number in the RX 570 discrete card. The likelihood of AMD realistically being able to squeeze that large a GPU component inside the same AM4-compatible package is pretty low, but we can hope.
A Ryzen 7 APU with such monstrous GPU power would be unprecedented and could be the PC gaming saviour we need in the face of the cryptocurrency inflation being inflicted on the graphics card market at the moment.