The devs expect non-dedicated multiplayer to go live sometime this week, while WPEs are set to enter a beta state at the end of the month. On the subject of release dates: Mega Update 3 is still in the works, but has no firm arrival to PTR or live servers, so maybe take those other release windows with a small grain of salt.
source: official site
Content retrieved from: https://massivelyop.com/2019/07/15/atlas-unveils-work-on-wild-pirate-encampments-and-a-non-dedicated-multiplayer-mode/.