Blizzard has updated the Diablo III Portal on Battle.net with new information about Myriam Jahzia, the Mystic. This will be a new and powerful ally in the Reaper of Souls expansion pack, a wise woman who will offer you sage advice. She's a skilled Artisan, capable of altering the very nature of even the most elaborate armor and weapons.
"She and her clan are nomads known as the Vecin—a spiritual people, blessed with magical visions. They hail from a matrilineal society who worship a powerful deity known as the Allmother. The Vecin believe that the Allmother is the source of their visions, and that it is because of her that all Vecin possess a sixth sense they call the Sight. While the Sight always manifests more strongly in Vecin women, it's especially strong in Myriam."
"Although she is quite a resourceful individual, Myriam proves no match for Malthael's forces and is trapped by their relentless advance," the blog adds. "You will have the chance to save Myriam while adventuring in the city of Westmarch, and shortly after encountering her, she will offer her Artisan services to you, regardless of your level."
Blizzard's blog also talks about enchanting. Players can reroll one property on a Rare or Legendary item by speaking to Myriam, opening up her Enchant menu, and then paying a material cost. Not all properties can be rerolled, but the ones that are capable can be rerolled over and over again. Blizzard wants the enchanting to be "meaningful" while allowing players to still hunt down loot with even better properties.
"Since the resulting property you receive during Enchanting will be random, it's possible that the new properties you're provided may end up being less desirable to you than the one you are replacing," the blog reads. "But fear not! In order to mitigate this type of buyer's remorse, Myriam will also offer the previous property in the list of options when using Enchanting. So if you don't like the new property that Enchanting offered you, you can always choose to keep the old one."
The blog also goes into Transmogrification, which can be read here.