When is WL 9 coming out?

What that retailer is offering appears to be WaveLab 8 with (probably) a voucher for an upgrade to 8.5 (or activation code on a card in the box). I would be careful about such offers – Thomann, in this case, are a reputable retailer but sometimes it’s not clear why they do these offers, possibly just to get rid of old (physical) stock.