With Skyrim's 1.5 update, there are new kill move animations for melee combat and kill cams on ranged weapons and spells. In addition there are some improvements to the games graphics such as a better transition when going under water, as well as other bug fixes. The 1.5 update is available from Steam right now, just go into settings and opt in through the client. There will be updates for Xbox 360 and PS3 players in the near future. Full details are here at the Bethesda blog.
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