Good news: Adobe is using JPEG XR in Flash 11 and Air 3 betas. Suddenly this format is looking viable. If it is in Flash then surely it will be in the next Photoshop.
@kettch: Sure, the high end will benefit from RAW formats. DNG can help to standardize RAW formats, sure. But a RAW format is not a (processed) image format and we need a good image format. It doesn't make sense for Adobe to limit the quality of its image formats just so they doesn't eat into RAW usage.