Here is a copy of what i received.
VOLUNTARY REFUND REQUEST AND RELEASE
...
Is this legal? They will not give us refunds for our pre-orders unless we agree to their terms?
They can certainly try to get you to agree to it, notice the word "voluntary". The bottom line though is that if they don't send you the product you are entitled to a refund and your refusal to sign a release like that doesn't really change that basic fact.