When will cruise schedules be released for first half of 2019?

Hi I'm a newbie and I was wondering how far in advance do cruise lines release their schedules.

I have cruises booked for 2017 and 2018 with Princess Cruises and have a friend who wants to cruise with me in 2019 and I would like to stick with Princess Cruises for that one too.

I just want to stay around NZ/Australia for cruise holidays and hope to snap up a great stateroom/suite for 2019 but I know that you've gotta be fast to nab the good ones so any 'heads up' on this would be much appreciated:)

You might try the Aus/Nz forum also for some great advice:):)

The Holiday 2018-19 schedules will probably be released mid 2017. Maybe later summer 2017.