Recent developments
A little update from the news front: The story has gathered some momentum recently, with the inevitable result of politicians getting involved.
According to media reports, there have been several similar incidents in the past 12 months, with flights being aborted or crews falling ill. Lufthansa has confirmed at least to similar incidents this year, among them an A330.
Meanwhile, German magazine "Der Spiegel" reports that oil is likely causing these incidents, not de-icing-fluid. The magazine quotes from documents by a Lufthansa aviation physician saying that "presumably flue gas and TCP inhalation" caused the Germanwings incident.
Lufthansa seems to be aware of the issue, as it's currently modifying engines, especially of its A380s. Also, the carrier is sponsoring development of a diagnostic tool to detect toxic fumes in cabin air.
German pilots union "Cockpit" demands immediate action by carriers. The "Bundestag" is set to deal with the issue in parliament this week. "Government has to acknowledge that there is a problem it can no longer ignore", a MP for the Green party is quoted.