I suspect the "special conditions" are those referred to (price rise etc) in the email Hill sent out today:"We are thrilled to let you know that the HX50 pre-order program has been a huge success, with over 550 HX50 orders from 50 countries.
Today, we are announcing a base price adjustment from £495,000 to £595,000, in line with the overwhelming demand for the HX50 and worldwide market conditions.
We have just launched our last pre-order program which still allows you to order your HX50 under very special conditions. Starting at £472,000, there will be a gradual price increase of £1,000 every 3 HX50 serial numbers ordered. These preferred discounted terms will end when the price reaches £595,000 or on the day of the first flight of the HX50 (whichever comes first).As our previous pre-order programs this last one will continue to be more rewarding to anyone who orders earlier than later."