The conditions don't say anything about what fare class you will be booked into, so I'm presuming that you will only get credit for your original booking.
Since I'm already in J on the outbound I will have to wait until this Saturday to see if they offer the same thing for the return flight. $699 certainly is fair value to me, so I might bite.
Last edited by Dennis88; Aug 8, 2017 at 3:19 pm
Reason: can't type decent English today