<font face="Verdana, Arial, Helvetica, sans-serif" size="2">I have yet to see more N class seats becoming available closer to "the date" (why would or should they do it anyway?).</font>
I didn't really expect that they would release more. The only reason I can think of would be if the more expensive tickets on the flight weren't selling. Paying more doesn't sound like much fun... I should probably just do something around Sydney on the weekend and forget about the points, like a normal person would.