Last PTR Build we got the Musics for patch 9.1.
As with all other patches before this implys that the release of the 9.1 Patch is very close (at the latest end of july).
However, today it was discovered that the Sylvanas Novel is officially delayed to February 2022
source: https://www.reddit.com/r/warcraftlor...ylvanas_novel/
This implys that what ever happens in the Novel, has significant spoilers about Sylvanas AFTER the 9.1 patch.
Since the Novel will now release with the Blizzonline 2022 and probably right before patch 9.2 or after, it's more than clear that we will see more of Sylvanas after the Raid.
This is the only right conclusion! Otherwise it would make no sense to delay a Novel so much longer that was planned to be released anyway several months later after the raid. (original date was mid nov)