If you’ve been flying in the North Atlantic Region over the past year and a half, you’ll be familiar with how it works – the new procedures were introduced there back in March 2019, and now they’re being rolled out everywhere.
The Federal Aviation Administration has already published a Notice to say that these procedures will take effect in US oceanic airspace from 5 Nov 2020, and ICAO is expected to formally publish the Standard in an update to PANS-ATM (ICAO Doc 4444) to take effect from the same date.
FAA Publication: https://www.faa.gov/air_traffic/publications/internationalnotices/intl_2_20012.html
Skybrary Article: https://www.skybrary.aero/index.php/North_Atlantic_Operations_-_Contingency
