O.K.
As far as I understand, we need someone to make correct color matrices for this camera to build into CHDK (It's different from IXUS 80).
And still, the colors of conversion from DNG will be incorrect and not the same as in JPG.
For this, a DNG color profile is needed (or separate profile, that can be loaded by a RAW conversion program) - and it's a difficult task. Tweaking colors manually for each photo to reproduce natural colors (or jpeg colors) is almost impossible, at least for me.
And that's true for all the cameras with RAW (or DNG) format (for CHDK-enabled RAW there is no support from manufacture or commercial software vendors).