The Acolyte of PlanetDiablo gives us a pictorial tour of the expansion pointing out some of the new features. The new title screen for the Expansion spotlights Act Five and the two new character classes. Characters can be created in Expansion Mode or Normal Mode. This Paladin takes the structure of Baal on, as he fights Death Maulers and Suicide Minions. Shrunken Heads are one of the types of character-class specific items in the Expansion, the group which are designed for the Necromancer.
Runes are another new type of item, a great new concept that more than expands socketable items.
They can be combined in certain types of items, in a special order, to form Rune Items, a new form of unique items. They also provide individual groups of effects. Charms are a new type of item in the Expansion Set. They simply sit in your inventory, but they are valuable for increasing resistances and providing other effects. Charms range from 1x1 inventory squares to 1x3 inventory squares in size.