How long is a piece of string....major routes get "re-released" - on the same or similar schedule as last year, to allow the early bookers to start filling seats. These are out now. 99% of the time this changes (sometimes right up until 4 weeks before departure) as analysis is done on what routes are profitable etc, new routes added etc. Everyone expects this year to be even more cut throat with off peak route freezes, especially departing the UK.