Great news for you.
I have some clients on that same sailing and I got a call last week offering them a paid upgrade to an A or B, I think it was $400 per person, which they declined, but hey you got it for free!! That is one nice thing with a guarantee, you can get upgraded - like Marc though, its never happened to us, except once, last December when we were on Crystal and had an E gte, we got upgraded to an A balcony.
