Still no direct answer for whether or not we are in a Mirror!Verse. Confirmation that Voldemort is acting to prevent Harry from destroying the universe--But I find myself still confused as to what he wants to do with Harry that is more important than killing him immediately to protect the universe. I would think that possibility negates any benefit of keeping Harry around.

In useless trivia: the Death Eaters got those masks and cloaks on in a hurry. It suggests that the outfits are some sort of spell that can be quickly applied, if seconds after being summoned the Death Eaters can arrive in full regalia.

The Dark Lord pressed his wand to the flesh above the severed arm's elbow, and the fingers twitched, twitched like they were alive; by dim moonlight Harry saw a darker mark appear on that flesh, just above the elbow.

Seconds later the first hooded figure appeared inside the graveyard with the popping sound of an Apparition. A moment after that came another pop, and then another.

The hooded figures wore silver skull masks, and moonlight fled from the robes beneath them.