You really think Best Buy needs to help create a demand? Seriously?
Yes they do, its a company not a religion. Well ven a religion need to hype up the fantasy so why would best buy be any different. Apple does it all the time not with their products but how secretive they are before the program comes out. But once the product is announced they are very good at not causing any artificial shortage.
On the other hand take your pick of companies from say Cisco to Sony we know months and months ahead what is coming.
Look at HP they put out a really nice UI and interesting tablet probably the only one I really see as wanting yet we have to wait almost 6 months before it comes out.
HP should have been ready to sell their product a week or two after announcing and not do the MS$ in the future check out this cool vapor-ware we have coming.