Welcome on Community.
There is no public and official date at the moment and Atlassian rarely does that kind of teasing :) You can check the EAP (Early Access Program) if you want to be trying it out as soon as possible! I can tell you that 7.11 will be there (it's in EAP) before 8.0, not trying to create suspens but you might also expect 7.12 :)
Hope this helps!
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