In Skyrim, apparently there's enemies that will burst out of their tomb now - and the spook zombies from Shivering Isles will probably make a return (a spook zombie is the one playing dead until you turn your back or move to a certain area, then gets up suddenly).
Spiders as well, reportedly their webs are environmental traps now that you can get stuck in. Can you imagine struggling to get free, while dozens of skittering horrors draw closer?
Source: http://www.thenexusforums.com/index.php?/topic/286552-skyrim-information/
Thoughts?