From what I have been told from my local boutique the special orders are placed twice a year in December and May and that would be a limited number for each boutique. (Only 10 SOs from my local boutique each time, only for their loyal customers) If you are offered for a special order, you can choose different colors, leather, hardware, lining, piping color, tricolor, bicolor, stitching of your own choice. Then the boutique will check if the colors and leather you choose are available, if they are available, after they place an order for you in Dec and May, the bag will arrive within 6-10 months. But if the colors and leather you choose are not avaible for offer, then it can take up to years.
The podium order is where each boutique go to order the bags for the next seasons which happen in February and July in Paris.
In July 2007, they order the bags for SS2008 which will start to arrive the boutique in Feb 2008.
And in Feb 2008 will be the orders for AW 2008 and the bags will start to arrive at the boutique in July 2008.
At the podium order, each boutique can choose the bags in what they already have to offer at the podium. Some new colors for the next seasons. There are also limited number in birkins and kelly and in croc for each boutique. Maybe my boutique can order 3 crocodile bags for each season only.