Well I think this is terrible news, Canon are cooking the RAW files at low iso values!
I agree with your disappointment - for me, a RAW is my negative, and I don't want anyone deciding how it should be pre-tweaked.
However, unfortunately, as we know it is spec-sheets that drive so many ****** internet reviews, and sadly, Canon have probably decided that financially, if you can't beat them, you have to join them.
I too hope there may be a backlash, and a reversal. Alternately, let Canon have a 'basic' RAW view that is seen as standard, and then a menu driven view that allows us untainted RAWs (we know most reviewers won't bother delving into the menu, so they can 'see' the cooked raw, while those that are bothered can find a way through to the untainted original).
Cheers
Stoical