During a Douyu stream, streamer 炎凉 (Yan Liang) talks about learning the release date for WoW Shadowlands patch 9.1 at a dinner with Chinese WoW operator NetEase. According to his information, patch 9.1 will be released in China on July 1 - in Europe on June 30. However, this statement still has to be treated as a rumor, as there is no official statement from Blizzard. Below you can see the clips it's about.
According to icy-veins.com translations, the three stream excerpts say the following:
"A Douyu employee and I learned about the release date for 9.1 on the same day."
"Some NetEase employees were in WuHan, so I went to dinner with them, and that's how I found out about the release date for 9.1 on July 1."
"Who told me about the release date? [Employee nickname]. Do you even know [employee nickname]? You don't even know that person."
If the leak for BC Classic on June 1, 2020 proves true, a late June release of Patch 9.1 would fit Blizzard's concept. As Game Director Ion Hazzikostas noted in an interview, they are trying to avoid the overlap of Classic content and retail patches.
In this scenario, BC Classic players would have a month to let off steam and then have time to look at patch 9.1 at the end of June. A 9.1 release on June 30 looks realistic at this point. The new Korthia zone has yet to come to life on the PTR, and at least two bosses in the Sanctum of Domination raid have yet to be tested - assuming the upcoming raid tests go smoothly this time around. The mega dungeon Tazavesh has not even been played yet.