https://magic.wizards.com/en/articles/archive/news/changes-release-ikoria-lair-behemoths-2020-03-26April 2 – Ikoria Debut, trailer
launch, (7 a.m. PT/10 a.m. ET/2 p.m. UTC) and the start of previews
April 10 – Last day of previews
April 16 – Ikoria released on Magic: The Gathering Arena and Magic Online
April 17 – Prerelease/release in Japan, Korea, China, Taiwan, and Hong Kong
May 15* – Prerelease/release in North America, Europe, Latin America, and Australia/New Zealand
*Also includes Brunei, INdonesia, Malaysia, Philippines, Thailand, Singapore, and Vietnam