Getting back to the original post, the attached white paper outlines a method for significantly increasing the sensitivity of colour sensors by replacing the RGB Bayer array. It discusses why others have failed and the implication is that the Aptina LRB technology can use advanced signal processing to provide significant sensitivity gain without the dynamic range and colour penalties of previous attempts.
If it works as suggested and finds its way into larger pixel devices, this type of technology could add one stop of sensitivity to DSLRs and one shot colour cameras for astro. Couple that with back illumination and there might be about 2 stops total to go before reaching the hard physical limit on the sensitivity of colour cameras.
http://www.aptina.com/Aptina_ClarityPlus_WhitePaper.pdf
If you are interested in how much CMOS sensor technology has advanced recently and where it might be going, the Aptina site has some good reads.