The developers at Bethesda have specifically stated in interviews that the levels of gore in TES games and Fallout are not, have never been and will never be similar.
In Fallout games, gore and dismemberment are a part of the feel that was intended with the game.
In TES games, there is some gore, but it is more to create an atmosphere of forboding prescence (I remember seeing a charred corpse being roasted over a fire in a house inhabited by Ogres - I put two and two together and imediately felt like I needed to avenge this poor burnt corpse [it also put a slight feeling of dread into me]; I proceeded to slaughter the myriade of Ogres upstairs in the most painful way I could come up with
).
In relation to this topic, magic finishing moves like burning a victim to death, or turning their skin icy blue from freezing all their blood would work - however I would doubt dismemberment is to be a major feature (apart from maybe the occasional beheading, but even then...).
Oblivion had charred corpses, so I don't see an issue with Skyrim using some similar representations for magically murdered victims - and in this case, the most gore you will see in a TES game is on a decayed zombie corpse level (and the rotten heads on spikes in the planes of Oblivion).
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