I agree with BJ in that Nikon is trying to "pre-empt" some people from buying the 300D for Christmas by announcing this early. Canon did have their 300D in the store within a couple of weeks of their announcement. And with Nikon's track record of delivering new products on time (i.e. when they said they would) isn't that great lately.
Let's just hope they can deliver this one as promised. But then again, they haven't promised much - how can you announce a new DSLR and give so few specs?