The C+P micro site and FAQ.
http://paywithkrisflyermiles.com/home.html
Rates look very crappy but glad that its one more option to reduce cash payment and increase redemption options. As long as there's a flight for sale, you can pay for it using C+P.
But a more interesting development -
4. Can I use my KrisFlyer miles to pay for the associated taxes and surcharges on my award ticket or flight upgrade?
No. At the moment, you cannot use your KrisFlyer miles to pay for the taxes and surcharges associated with award tickets and flight upgrades. We are working towards providing this payment option in subsequent phases of development.