I’ve been waiting so long for news for 3.0 that I’ve actually gone back to look at when the last few updates were announced, put on test live and went live after Isle of Siptah to get an idea of which day of the week 2.9/ 3.0 news will drop.
Follower Emotes, Bug fixes/patches
2.8: Went Live (Jan 26,2022, Wednesday)
2.8 went on Testlive (Jan 6, 2022, Thursday)
2.8 no Devstream or trailer, went from Testlive to Live
Grave Matters Event
2.7: Went Live (Dec 8, 2021, Wednesday)
2.7 goes on TestLive (November 19, 2021, Friday)
2.7 had no Devstream, but released a Trailer the same day as the Event went live on Dec 8, 2021, Wednesday.
People of the Dragon DLC and 3.0 first teased
2.6 Went Live (Oct 21, 2021, Thursday)
2.6 DevStream was (Oct 15, 2021 Friday)
2.6 went on TestLive (Sep 23, 2021, Thursday)
QOL Update, small animal pens, weapons on backs, bug fixes
2.5 Went Live ( Aug 19, 2021, Thursday)
2.5 went on Testlive (June 24, 2021 Thursday)
2.5 no Trailer or Devstream, went from Testlive to Live
So, to summarize; Updates go to Testlive on Thursdays (3) or Fridays (1). Updates go Live on Official servers Wednesdays (2) and Thursdays (2).