I suspect the probable outcome will be described as "super-cooled" icing.
It appears from an article in
news.com.au published a few hours ago that the lowest temperature that pure H2O will remain as a liquid has been extended from -41/-42°C to -48°C.
This would cover the AF447 situation where the nominal OAT was -43°C and an updraft containing super-cooled droplets could have created an "ice-block" on the pitots and possibly other surfaces within a second.
The initial pitch down and roll to right at A/P disconnect may have had as its origins, the same cause.