Tell me what massive, open world game, with full NPC schedules and thousands of items that are all fully rendered and can all be manipulated is currently on the market, so I can go buy it right now please.
I think you're free to enjoy googling that yourself ^^
Also, the items rendered are Skyrim really not that many as "thousands". If you look at the trailer, you can see bushes and foilage being rendered at some mere 20-30 meter (or something like that) at the beginning of the trailer when the dragon flies over the forest.
I also think it's kind of fail in logic that Bethesda says that the big deal about their new engine is that it renders everything and has such a big rendering distance, yet you can see this mentioned above in the trailer. And yet there is loading screens for towns and for houses and whatnot.