Does this mean we will finally be able to reign righteous hell upon The Dark Brotherhood?
I sure hope so! one of my favourite thing about the factions in Morrowind was that sometimes you'd be given quests to anihilate members of the other factions
'course, it made becoming the leader of every faction very difficult, impossible for the great houses, but that's what was fun, you couldn't do everything, so what you could do had more meaning. From what I've seen so far, Skyrim may be wandering down this road again, the perks for example, they've confirmed that it's impossible to get every perk in one playthrough, heck, you probably couldn't get them all in 3 playthroughs. To em this is a good sign that you'll likewise have to pick and choose your friends and factions.