Iceland 2019 UK Silhouette

Hi Basically to be precise the question is does anyone know when Celebrity release the sail itinerary for the later 2019 sailings? - I know this is very forward thinking, however we are planning a future cruise to incorporate Iceland and due to 2018 holidays already booked it will have to be in 2019. The P&O itinerary is now available and we have provisionally chosen Arcadia for July 2019 (but not booked as yet).

I would like the option of a price/itinerary comparison to Silhouette, who are sailing to Iceland August 2018, but no sail dates as yet available into 2019. UK CC members may appreciate more why I am asking the question as there are very mixed reviews re Arcadia and I think that Silhouette may be a slightly better option having sailed Equinox and Constellation (Celebrity) and Britannia & Ventura (P&O) but never on Arcadia.

Thank you.

The usually announce upcoming itineraries starting in November and it takes about two months for all of them to be rolled out.