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I'm surprised there aren't more "don't know yet". There hasn't been anything completely conclusive, although there have been hints (in different directions!).
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I don't know if this is really a spoiler, but just in case, posting here rather than the other thread.
While much has been speculated about the impact of Watson’s marriage to Mary and the arrival of their newborn, the addition to the family doesn’t disrupt their relationship in a major way. “As in the original stories, Sherlock has no problem at all with Waston being married,” he points out. “Sometimes that’s portrayed as a kind of jealousy thing, which is a bit weird.”
So no jealousy. Not that that's a clincher by any means - he might just not be a jealous person! But it could be another clue.