It appears that the name of the game is that NPAS are paying for the P68R to be certified to meet the icing requirement.
I have not had sight yet of any document that states that certification has yet been acheived.
I expect that certification work lies with either Airborne Technologies in Austria and/or Vulcanair in Italy. As the first certifiable airframe only appears to have been completed late last year, will only be delivered in late June, and a 'fully operational' unit is not expected to be on line until January next year it may well be that the process is ongoing.
So "not certified but hopeful" appears the situation. I am no engineer but I assume that adding the weight of de-icing gear will alter the weight, balance and performance somewhat. So any readily available documents will relate to a different, lighter, version of the P68R.