"the company said future generations of Ryzen chips will have better IPC (instructions per cycle), clockspeeds, and overclocking." In the linked PAX West interview, Woligroski says the Zen 2 specifically will focus on higher IPC and clockspeeds.
"we now have confirmation that the first of these—the Ryzen 2000 Pinnacle Ridge desktop CPUs—are set to arrive in just over two months’ time." It is worth noting, that Pinnacle Ridge is not Zen 2, but still considered an updated Zen 1. There are no claims by an AMD representative anywhere in the cited articles about what the focus of the upgraded Zen 1 processor will be.
"—essentially making Pinnacle Ridge AMD’s tick in the tick-tock model—and they use a refined Zen+ architecture. All of which means higher frequencies, power improvements, and (reportedly) support for higher DDR4 memory frequencies." Again, the only interview linked in Techspot, Woligroski is talking specifically about Zen 2 aka "Matisse". The conclusions that Pinnacle Ridge will also support all the things listed isn't supported by any reputable citation. It can be a logical inference to assume clock speed and power efficiency gains based off the drop to 12 nm from 14, but we'll just have to wait an see. I for one expect that the SenseMI improvements seen in the Raven ridge APUs will make their way into Pinnacle Ridge as well, and help with lightly threaded performance.