1. Shadowheart. Some sort of mysterious magic we don't know about yet.
2. Astarion. A vampire spawn with at least one special ability (bite).
3. Gale. A magic orb in his chest that he may learn how to control.
4. Karlach. An infernal heart that makes her burn.
5. Wyll. A magic eye called a sending stone that may be able to do interesting things.
6. The Dark Urge. I think it goes without saying that the Dark Urge experience is going to have something... extra.