The - at this early stage - available data is a 100% match with other sensor icing incidents on Airbus models, like this one:
Incident: Lufthansa A321 near Bilbao on Nov 5th 2014, loss of 4000 feet of altitude
another one:
http://www.flightglobal.com/news/art...emerge-379921/
Recovery was only possible there, because the captain was intimate beyond required airbus driver skills with the computers and pulled the critical hardware units "cold turkey". Had more "mainstream" pilots been on board, the outcome might have been comparable to what we got today.