URTF,
Sorry for the spelling. According to quotes from many interviews and press conferences with Al-Baker they are definitely getting them. I was only able to find one interview on me now.
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"FLUG REVUE: But that means you have not yet signed the final purchase contracts for the A380.
Al Baker: Yes, that is correct, we have paid a very high deposit and signed a Memorandum of Understanding, but the actual contracts have not yet been signed. The aircraft has not yet been finally defined, and one cannot sign a contract until the precise design has been fixed. Other launch customers have not yet signed either. But there is absolutely no doubt that we shall be ordering these planes in the near future."
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I guess this is good enough proof that QR will get the A388.