New instances,

I did the Hall of Mirrors yesterday and must say it was most fun, even at one point I was most frustrated with the puzzle. It was bit longer than I tought. Not going to put any spoilers here before people are trough it, but for HM version don't kill adds at last boss.

I presume that this is the same one as book 8 chapter 3 Vin?

Yes it is,

go pick up the quest from Chamber of Crossroads before heading to that chapter. Although ye might want to delay doing the quests until ye have some Legendary Items to level (I think the 6 quests from Halls of Crafting awarded me 45k LI exp).