The low-power APU line has been lagging behind the Ryzen desktop solutions. Back in April 2017, when Ryzen 1000X series were announced, the only APUs available were based on Bristol Ridge architecture.Via: VideoCardz
The succeeding 2000U line was indeed using Zen, but it was introduced in October, months after Ryzen 1000X series, but also months ahead of Ryzen 2000X CPUs.
The sudden appearance of 3700U could, therefore, indicate that the 3000X series are at least 6-7 months away from now (assuming 3700U launches soon).
AMD Ryzen 7 3700U spotted with Picasso GPU
Posted on Thursday, Nov 15 2018 @ 10:21 CET by Thomas De Maesschalck