Adding to my previous prediction comment:

Predictions: (I'll have to score them all after the epilogue is released, but hey, it means we get an epilogue.)

The "phoenix’s egg" password will (directly or indirectly) allow Harry to find Narcissa Malfoy. 70%

The Line of Merlin feeds information to its rightful holder when they’re holding it. 60%

At least one Legilimency conversation occurred during Chapter 119. 90%

Speculations:

What happens if Harry casts the True Patronus through the Elder Wand? Given that it’s a Deathly Hallow that raises the priors of something interesting happening with a spell embodying a preference for life over death, but with the "sense of strength and constrained danger, like a leashed wolf" Harry feels when holding it I’m not sure what the effect would be.