Downloaded the 0.48 alpha package and started to play with it. My first interest was the capability to use CMYK colors. Before 0.48 the doctrine was that you could use three out of four CMYK colors but not 4 out of 4. With 0.48 as you move one CMYK slider one of the others tends to jump back to zero but not always. By fiddling some I was able to establish rich black at 60,40,40,100. Given that internally Inkscape is still using the RGB color model I wonder if this is a color that will actually be used for output. There are several swatch bars available but none seem to be expressed in CMYK terms. If in fact all possible CMYK colors can be expressed in RGB terms then it should be possible to use pseudo CMYK colors on the Inkscape color bar and pass these shades on to e.g., Scribus in RGB format. I would be interested in comments from the developers on this.