The thing is, Skyrim will ship with the settings "turned down" so that it can run smoothly on consoles, with no way to turn the detail up on a high-end PC.
except through ini tweaks - like, you know, most other games.
Textures are low resolution even though even mid-range cards come with 1GB of RAM these days. Qarls textures for Oblivion look more detailed.
Qarl's textures don't have to worry about the lowest common denominator of PC hardware because Qarl isn't selling his textures. Bethesda is. making sure the game runs well on the widest variety of systems is more important than making a couple angry neckbeards happy.
also you don't know what Skyrim's textures will look like so this argument is invalid right now. all of Bethesda's games have had higher-res textures on PC than on consoles.
Still no shadows for objects from what I can tell. A feature that has been standard in PC games for a couple of years now.
there are shadows all over the place what are you even talking about? have you seen any screenshots at all? like http://cms.elderscrolls.com/sites/default/files/tes/screenshots/Riverwood.jpg? or http://cms.elderscrolls.com/sites/default/files/tes/screenshots/Tavern01_wLegal.jpg?
Of course, there will be mods for the PC, but there are some things (like hardware tesselation and shadows) that you can't just mod into the game since it sits so deep at the core of the rendering engine
except shadows are already in the game and you can mod the hell out of the lighting in most other moddable games so why would Skyrim be any different?