That's what I have heard. There are around 170 seats remaining in the bottom tier, 600 odd in the top. If we can shift them all in the next month or so we will have around 22500 season ticket holders next season by my estimation but the vast majority of the remaining seats are towards the more expensive end of the scale so we will have to see.
Clear polycarbonate panels go yellow pretty quickly unfortunately. Twinkenham's roof is probably the worst example of this.