After having booked a ticket nearly a year ahead to Brazil (World Cup 2014), I wanted to upgrade for such a long flight. I was aware that the probability of having Upgrade available now is very low.

But I was quite sure that the 2 seats allocated for gold members would be available.
So I have phoned to an agent who was aware of this special inventory, but she told me or that the two seats have already been booked or not yet released.

Does someone know when those two seats usually are released?

Thanks