German paper Der Spiegel says the pilot had taken a several month break during his education to treat depression. The break is confirmed by Lufthansa but the reason was given through the pilots personal circles - Lufthansa is not commenting citing medical confidentiality.
I also read that there are no psychological evaluations of pilots.
I am pretty sure that is going to change very soon.
Horrible way to go for the passengers and crew. Run into the ground in a perfectly good airplane by a madman.
G