Kaby Lake G is expected in early 2018 and an ongoing collaboration may result in a 10nm chip with Radeon graphics. FUD Zilla says the successor to the Kaby Lake G may feature Vega or Navi based graphics cores:
It might be more than just a few quarters until you see the successor to Kaby Lake G, but our sources are confident that this will have a 10nm Intel CPU inside, but it is unclear if the graphics will support Vega or the Navi architecture.
Time to market might imply that Intel might be going after a Navi 7nm graphics part, but this is not something our publicity shy well-placed sources are ready to confirm or deny. It could be the Ice Lake G architecture based part, as Kaby Lake G is the only 14nm component that will arrive for performance notebooks in 2018.