And again Legion had 1 small zone still in development as well as an unfinished class in the demo. Iirc 1 spec only, almost no talents (since they are over 100 mostly) and no artifact which is a huge part of the class. Again less stuff than the BfA demo (2 zones, 2 instances, 2 allied races)
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No, next week release is not possible because of how the development cycle works (broader test after internal QA) even if all the stuff is finished.
And going by the demo a summer release is possible and has a pretty good chance of happening since there is less new stuff that needs to be worked on than for legion after it's demo. (which was pretty much EVERYTHING for legion, even DH was less than half done).