Ryzen Mobile 3000-Series was already launched at CES, it's already available in certain models. It's also worth mentioning that these are 12nm chips based on Zen+, not 7nm and Zen 2 (the new architecture launching in a couple of weeks).
Yep. The 7nm is coming in Q3/Q4 as the Ryzen 3000 for desktop, the mobile ones based on 7nm aren't even on the roadmap yet, and if, would be the mobile Ryzen 4000 series.