When to start thinking about 2017?

[EricJ]

I've had the urge, but probably won't be able to afford the remaining tiers of 2016 cabins, and I doubt anyone has a wheelchair Access cabin, that I might need.

(If anyone has one to share, I'll listen to any offers.)  

 

So, as I may have missed that bus, when can I look forward to next year's--if it's pretty likely there'll be one--starting the early pre-orders?  

I realize guest lineup is pretty much down to the last minute, but how early is too early to look at travel reservations and itinerary?