Recent sales of the original Nintendo DS in Japan have been bouncing up and down like a yo-yo, dropping as low as 8,000 one week, then jumping back up to 40,000 and 60,000 units a week. It has been quite apparent that whilst stock of the DS Lite is low, the original DS system's stock has been all over the place.
Now there seem to be reports coming out of Japan that hint toward the original DS actually being phased out, despite earlier comments by Nintendo President Satoru Iwata-san to the contrary. According to wholesale retailers, as reported on GameFront.de, there have been no stock replenishments for a month, with the focus being solely on the new DS Lite. Nintendo has not confirmed anything as of yet, but for it to be phased out so quickly seems quite an oversight as it could have worked as a potential lower-priced option for gamers, as it is quite apparent it will still sell in great numbers, even beating out the PSP when at full steam.
Hopefully official confirmation will arise at some point. But until then, stick with C3 for further updates...