The processor part of the chip will reportedly have four Zen cores, with 512KB L2 cache per core and 8MB shared L3 cache, as well as DDR4-3200 support. The site claims the Zen APUs will feature up to 11 GCN cores, which results in up to 704 stream cores:
The next generation GPU and multimedia core supports H.265 10-bit encode and decode, something that we see with introduction of Polaris 10 Radeon RX480 and RX 470. The Zen APU graphics will be closer to a Polaris 10, RX460 core but obviously with less stream processors. This will be one of the fastest, if not the fastest APU ever for notebooks and even for consoles and embedded.The regular versions will have TDPs in the 45W to 65W range, whereas the embedded versions will have TDPs as low as 12W to 45W.
The same GPU can also decode VP9 as well as up to four DisplayPort 1.3s, an HDMI 2.0 or DisplayPort 1.4. matched with a next generation chipset there will be a few new tricks you will see from Zen APU including USB 3.1 including USB Type-C, NVMe.