Strictly you can always cancel a preorder. But you can not cancel a perk on IGG.
A preorder gives you a guarantee to either get the device or your money back. A IGG perk is like a share. We invest and hope to get the perk. Though at this late stage of the IGG campaign where production are said to start this week, the risk should be fairly low. Also make sure to check what the terms are for taxes and shipment, they might be included in one and not the other, (might vary with region)