I got stung by this new policy too. It's my own fault for not reading the pre-order rules.
What happened was that along with the preorder I also had an in stock item in my cart.
Because I paid up front, I paid shipping on both. So then I found out that the in stock item won't be sent until the preorder is shipped.
I asked them if I could cancel and reorder them both separately, but they said no. So then I asked if I could be invoiced for the separate shipping cost, so they ignored me again and closed the ticket.