Here's a copy of the email I received in July for an August sailing.
In review of current rates for your sailing xxxxxxxxx, we have identified a price drop in the amount of $1199.9.
As a one-time good will gesture, we have created 100% of that amount as future cruise credits for you below:
2372943xz - guest1 - $599.95
2372945xz - guest2 - $599.95
These credits will be available for one year to book and sail, upon completion of your current sailing on Debarkation Day.
Please note terms and conditions include but are not limited to the following: Your future cruise credit (FCC) is only applicable towards sailings six days or longer, FCC provided is non-transferable, FCC provided is non-refundable, FCC is issued to guest 1 and 2 on the reservation only, guest who cancel their reservation prior to sailing will have their FCC deactivated from their client profile.
Thank you for choosing Norwegian Cruise Line, we look forward to welcoming you aboard soon!