ATM only speculative leaks (anything from premature store listings to infamous AdoredTV "leaks", pick your poison), which all point out to R5 3600G having a 20CU Navi iGPU. Even if it has no per-core performance improvements over older gen GPUs, it's still going to be as fast as 20CU RX Vega M GH (or an identical iGPU in Subor Z). In both cases it's an equivalent performance of a discrete GTX1060.
What about the power draw?
Radeon VII * 20/64 is still over 100W peak. How much more effective would Navi have to be?
Either a miracle or a serious underclock (and there goes your GTX1060 equivalent ;-))
What about die size?
Radeon VII * 20/64 is still 103mm2 - over 50% more than GPU die in 2400G.
Moreover, the chiplet in Zen2 is ~75mm2.
I'm not saying it's not possible, but very difficult for sure.
And what about the lost art of "making sense"?
RX550-RX570 still sell pretty well. So even if all those customers got an APU, it would have to cost $200 to fill the revenue gap. I don't think that's the price people expect.
Clearly, I'm not a fan of how AMD does their business, but even I don't think they are that stupid.
Or are they?
Gonna get a nice performance boost with watercooled 1600X.
Honestly, why would anyone watercool a 1600X?
If you have to buy the cooler, it makes no economical sense at all.
Even if you already have a cooler that fits, you'll still likely be better off selling it and getting a faster CPU.
And it's not like there's some amazing OC potential in that CPU anyway.