DPreview has previews of the new Nikon D70s and D50. The typical prime difference between generations of digital cameras - the megapixel count - has not changed and although the performance improvements in other areas of the camera are no doubt significant, it won't inspire upgrades. (I've not seriously considered upgrading from the 10D to the 20D, even though the non-sensor related improvements are quite significant). However, the new cameras should bear the good sale's record of the D70, and perhaps improve upon it.