Accident report is out.
http://www.asc.gov.tw/asc_en/acciden...accident_no=85
The aircraft encountered severe icing conditions. Aircrew did not respond to the situation quickly enough(such as descending into warmer air as well as to maintain airspeed and aircraft control was lost. Autopilot remained engaged until control was lost when it should have been disconnected during the icing encounter. No stall recovery manouver was initiated and the aircraft hit the water at about 90° nose down with engines at cruise power.
The captain reported directly to the airport instead of to SOC resulting in a phone briefing instead of a face to face briefing with the dispatcher. The Taiwanese investigators felt that this had no bearing on the accident but good old Airbus, or I mean the BEA says in their comments that this may have contributed to the accident.