So there are two RR? 15-35w and 35-65w?
This is most problematic thing to accept. But lets look at clue which we have.
Raven Ridge is mobile APU codename. Already there is 35W package, with 4C/8T+11 CU Eng sample floating around with 3.0/3.3 GHz core clock for the CPU. This design is supposed to scale from 4 to 35W. AMD can just disable CU's and CPU cores to fit it in 4W TDP envelope. There is no problem here, at all.
Raven Ridge is coming 2H 2017 for mobile. That is unquestioned. Desktop Raven Ridge is coming Early 2018.
Next. Horned Owl is supposedly server, embedded and machine learning market APU, that is not based on 16C/32T, 64 CU+HBM2. According to sources it is supposed to be variant of Raven Ridge APU, and Banded Kestrel is separate design with 50% of Horned Owl Package. Horned Owl is supposed to fit in between 35 and 95W TDP envelopes. Horned Owl comes 2H 2017, and Banded Kestrel is coming... in 2018.
Why would you need separate design if you already have a design that fits it perfectly? It does not make any sense. But it appears to be the case.
There is another possibility. What if Raven Ridge 4C/8T+11 CU design is actually... Banded Kestrel.
We know that HBM2 is supposedly expensive, right? Maybe AMD decided to go all out on APU, and make one gigantic design to fit alongside the Ryzen 7 CPUs, in the same line, with similar naming scheme? For example Ryzen 7 1800G 8C/16T+22/24 CU design+ 4 GB of HBM2 with 512 GB/s, and price it accordingly, at 499$?
Lisa Su have said before that they will have Vega GPU stacks rolled out "sort of top to bottom".
4096 GCN core dGPU,
3072 GCN core dGPU,
1408-1536 GCN core APU.
704-768 GCN core APU.
The only thing that would be against this
idea is that this APU would absolutely cannibalize the sales of the Ryzen 7 CPUs.
Anyways, this is just my theory. We will see what happen.