"...has higher textures…much higher resolution (logical, not even worth mentioning), and a lot more graphic features".
I'll be sure to remember that, Todd. If that's not true, it'll be (-(Infinite) Karma) for you (which would leave you exactly at 0 Karma).
You know he means it's as much of an improvement as you'd expect. He's not promising you the world. Nor the team either. Look at other games like Deus Ex:HR or Crysis 2 from console to PC to get an idea of improvement. Although those two were built on DX11 if I remember correctly.
Base improvements as you'd expect. Even if it was fully PC developed it'd be marginally better. It wouldn't bring the RPG back. That was lost from Daggerfall to Morrowind. So many mechanics lost. Same for Fallout 3 which has had the least mechanics to date.
Bethesda Game Studios would of had to answer the call of a widening market and larger player base who can't handle or don't want to learn playsets of any RPG. This is shown in Arena in the first place. It was more obvious with their first commercial and mainstream hit: TES III Morrowind
The goal of any company is profits. Dev teams need an assured profit margin to keep the company running and every employee paid. Bethesda Softworks and Zenimax handle these corporate decisions.
Unfortunately other than DLC the market would be the same. And at a technical front making a game like Skyrim with great graphics is harder than Red Dead Redemption right at the base. From tracked world dwelling NPCs who don't respawn if killed or have to remain/can't just disappear to all the little objects. It's more taxing.
That's why those open world games graphics are usually behind say Mass Effect 2 which is straight linear or Deus Ex: HR which is open but linear. Skyrim isn't at a bad line. But again with a PC only industry this Skyrim would exist, it'd be just as statistic mechanic deprived, and maybe a DX11/12/whatever encoding but only marginal gains.
But again Skyrim looks fairly competitive. Note though I won't overglorify it technically.
These open worlds are possible by mass reusing of textures and assets around the world. Morrowind, Oblivion, Fallout 3, and especially New Vegas and all accompanying DLCs are examples. It's more content but not usually memorable content. Like eating a large bag of chips instead of a primo steak.