Well the forums are already getting posts of the new 4xxx APU's not working with their own AMD discrete graphics. I don't know how many years this has been a disturbing pattern.
Crazy as AMD APU/CPU no issue with Nvidia GPU. Intel integrated graphics no issue. Intel with AMD graphics okay. Intel with Nvidia okay. AMD CPU/APU with AMD discrete graphics, total nightmare that defies all logic. Exactly why I refuse to buy AMD laptops.
I for one can't believe another series will use Vega. I guess it guarantees another generation of more of the same issues too.