So far only speculations, FDR and CVR are still in the lab abroad (I am not sure what equipment of this kind is available at Bell 429).
In the media there were additional reports that pilot had night vision equipment and there was unexplained U-turn in the path of this flight – the original destination was a hospital in Banská Bystrica.
But I would be very cautious regarding informations of the media before official report but I will post here once something important will be known.