This is now set to launch on MONDAY morning, Australian Eastern time [this Sunday night UTC]. It will correspond with some mainstream media articles that notable friendly journalists have - we hope - filed for publication that day.
WMF-legal, Comms, the ADA, EFA and some other local organisations are aware/ready. We have some pre-announce embargoed press releases going out as well as things on the day (including a post on the Wikimedia blog).