For anyone interested in when the previous release dates were, I did a little bit of research and this is what I found out so far. I am going to list the date on which the new itineraries where released, the first booking day for Gold and Platinum
Castaway Club members would have been the day after the realease day and then one day after that the booking was opened for everyone else.
"Winter" means first cruise in the new year up to April/May (not including the transitioning cruises).
"Summer" means about May to August/September.
"Fall" means about September until the end of the year (ending with the last cruise starting in the old year).
It still is a bit of a work in progress and I will verify dates more specifically. I will also try to add on more historic dates.
My plan is to post it as a seperate thread that then is easy to refer to and I am planning on keeping it up to date as new release dates come.
Fall 2017 - May 24, 2016
Summer 2017 - April 12, 2016
Winter 2017 - October 6, 2015
Fall 2016 - May 18, 2015
Summer 2016 - March 24, 2015
Winter 2016 - October 28, 2014
Fall 2015 - May 19, 2014
Summer 2015 - March 25, 2014
Winter 2015 - November 12, 2013
These are the easy years, before that things were released in different batches and I still need to verify things better, but this is what I have so far:
revised itineraries Dream, Magic, Wonder (they had originally scheduled the ships very differently) for October to December 2014 - June 18, 2013
Dream/Fantasy September to December 2014, Magic/Wonder May to December 2014 - February 12, 2013
Dream/Fantasy January to August 2014, Magic/Wonder January to April 2014 - December 4, 2012
Magic/Wonder all 2013 - June 26, 2012
To me it seems that with the new ships arriving they had some scheduling difficulties at first, but now seem to have settled into a rhythm on releasing the itineraries for all the ships in three season batches.
So, looking at historic evidence from the 2015 through 2017 releases my guess (and that is all that it is!!!) would be the following:
Winter 2018: anytime between October 4, 2016 and November 15, 2016
Summer 2018: anytime between March 21, 2017 and April 11, 2017
Fall 2018: anytime between May 16, 2017 and May 23, 2017