I can only agree with crossunder. During the 19 years and more than 11000 hours on the Dash 8 100,300 I had a lot of flights in icing condition, up to severe. Just switch any deicing or antiicing equipment on and increase your speeds according to the book. You will never have troubles.
Lets hope that the DFDR and CVR are readable. NTSB will find the reason, all other things are more or less speculations.