While we are still far away to see a first actual product based on AMD's next-generation Zen architecture, we now have some details regarding it, including a next-generation APU design that will be based on x86 Zen architecture paired up with Greenland based GPU with HBM.
While such 16-core based high-end HSA APU might not come anytime soon,
a slide leaked at Fudzilla.com suggest that we might see an APU that feature 16 Zen x86 cores with 32 threads which will be paired up with Greenland based graphics part with 16GB of High-Bandwidth Memory (HBM).
The design for Zen architecture pushes AMD away from usual module core design seen with Bulldozer architecture, where two cores shared certain resources, while Zen architecture features 16 cores, each with 512KB of L2 cache and 32MB of shared L3 cache. The rest of the features include support for quad-channel DDR4 memory, separate HBM controller with up to 512 GB/s of bandwidth.
Due to sheer amount of transistors put on a single die, it is highly unlikely that such high-end APU will be based on existing 28nm manufacturing process so this design will most likely wait for a newer and smaller manufacturing process.
Source:
Fudzilla.com.