Unfortunately I think the ¥3000 coupon is a thing of the past. It was originally introduced to celebrate the anniversary (4th or 5th I think) of the hotel's opening, and then repeatedly extended, even after it was set to expire. Maybe they'll bring it back for a short period to celebrate another anniversary, but I fear it has gone the way of FFN.

The 10% dining/spa discount for GP members runs until 31 March, and I would give that a fair chance of being continued or at least re-introduced from time to time.