A pre-order can be fulfilled in 3 ways.
By direct payment: you pay 100% in advance
By Pre25: you use code "pre25" so you now complete 25% of the amount and 75% when order is in stock.
By I want it: you use code "iwantit" so you now complete 25% of the amount and 75% over a maximum period of 10 weeks. Delivery as soon as in stock.