This means the resolution for colour will be compromised even more...
Also, I do not believe the increase in sensitivity is that much.. the number will be 20% or slightly more, judging by the number of pancromatic pixels (unless they are using high transmission filters, and filters used so far are of relatively low transmission)
Foveon has something much better.. This technology has been developed couple of years ago and Sigma has already commercial cameras on the market for some time.
They are very expensive, though....
www.foveon.com