All of what they said about skyrim so far turned out to be true. I really don't think they're lying this time.
You cannot say that until after you have played the game.
Bethesda didn't lie about Oblivion. Take the Radiant A.I. for example. They stated that every NPC would have a schedule they would follow and goals to accomplish. All of that is true, however, their video production only showed the best parts and ignored the poor parts. Marketing 101.
They are trying to sell a game. They are not going to say that the new AI gets boring, or that there are only a few quests generated and they get repetitive, or NPC's conversations are stagnant (Obviously fake examples, I can't know)