The first products with this Intel+AMD chip are expected in Q1 2018 and a lot of analysts suspect it could be Apple that brokered this deal. The thinking here is that Apple needed more powerful graphics for a future line of slim laptops. Intel can't deliver this so analysts suggest Apple may have pushed the chip giant into entering a deal with AMD to make this possible.
Word is going around today that these new laptop processors with AMD Radeon graphics may carry the "Kaby Lake G" codename. TechPowerUp dug up some details and speculates these upcoming quad-core, eight-threaded Core i7 laptop chips may feature 24 compute unit with a total of 1536 stream processors. Polaris uses GDDR5 memory so the use of HBM2 is a hint that this product may be based on Vega.
For some benchmark scores you can head over to TechPowerUp, they found a bunch of GeekBench, 3DMark 11, SiSoft Sandra and Ashes of the Singularity scores. Performance-wise the faster versions of this concoction may be able to beat parts of the NVIDIA GeForce GTX 1050 series. Pretty interesting stuff this new Intel+AMD, I'm especially looking forward to see the power efficiency figures.