I'm looking for October.
If this is any gauge:
About three weeks ago (in February) their schedule opened up for June, July and (part of )August. When we took our cruise last year, the schedule for April opened up in the previous December (which was friggin' great, paying for airline tickets a few weeks before Christmas!!!!!!) So it seems to me there is a pattern of opening up the schedules every 4 months.
I am guessing mid-April or May for the August, September, October & (maybe) November schedule. I've downloaded DING and check every day!