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Very interesting article, for those who didn't know this yet. (Me, for one).
There's a radiant quest mechanic which will generate quests (also for factions) after you are done with the specific storyline quests. So you can keep on thieving and assassinating with a reason and incentive for ever and ever.
Very smart addition! I always ended up feeling sad after completing most of the faction storylines in TES games; after that you have to entertain yourself but it's much more immersive if you are given tasks now and then. So this should really take care of that feeling of emptiness.