Pre-ordered items, which are clearly identifiable by either a special 'I accept this is a pre-order' tick-box and/or a flash on the product image, are shipped on the date shown in the product description (which may be up to two months in the future). If you order regular items in the same order as pre-order items your complete order will be shipped on the pre-order date. If you don't want this to happen you should place two separate orders.