Call me a cynic if you will, but I for one will be buying Skyrim just as soon as the CS becomes available. And not a moment before. I imagine many in this community feel the same and I very much hope Bethesda realise this. If for any reason a decision were taken to prevent modding then I would regretfully abandon the game series.
Well, what if for instance the article in Game Informer includes the developers saying that a CS will be coming out, although maybe not simultaneous with the game's release? Will you still wait, even if the developers themselves explicitly stated at some point before release that there will be a construction set? If so, that's just plain stupid.
For one, don't you want to spend some time actually PLAYING the game before either working on mods or playing the game with mods? If it'll take a month or two for Bethesda to prepare their tools for consumer use, fine. In the meantime we'll probably be having lots of fun playing the game and perhaps doing a few basic texture replacement mods if possible (if they stick with the DDS format, which I'm thinking they will unless they've developed some awesome new texture format of their own or something).
Lastly, I think the quote I recently put in my signature pretty much sums up Todd Howard's view of the modding community quite well. I seriously doubt we have anything to fear except maybe not having the official tools right away. I do hope that they actually confirm that there will for sure be a CS just to put a lid on all these posts asking if there's actually going to be one when it's already a near-certainty.
Edit: Changed my signature slightly to provide better context for the quote.