sunshadow21
Explorer
Keeping high interest that long could cost them a lot of money, and it isn't entirely possible to "burn out" the anticipation of the audience.
Keeping high interest after the release is also going to likely cost them a a fair bit of money, and if they aren't willing to spend it now, what makes you think that their task is going to be any easier after the release, or that the corporate suits will be any more inclined to spend money later on? WotC is not going to be able to use word of mouth to sell this edition; too many people have simply tuned out. Money will have to be spent, and lots of it over a fairly long period of time. They aren't doing themselves any favors by passing over such a key announcement so blandly; they need wide spread attention, if for no other reason than to make sure as many people as possible are aware when they do start spending the money.