Congratulations to a lovely couple. I'm sure many years of happiness lie ahead. Me and the missus hope to go on this ship in the not too distant future too.
We're not experts by any means! But obviously weather conditions will be massively different. Lots of warm clothes needed, and make sure on a sea day you get a spot in the solarium or indoor pool nice and early. Do as many of the shows as you can - We Will Rock You and Spectra's Cabaret are both amazing. For a more in-depth look at that specific cruise check out 'Views And Queues' on RU-vid. They did that same cruise on Anthem last year and go really in depth :)