I guess that in the very next weeks, these new catalogs will land in our favourite Boutiques and ADs...
As for your question, yes, as each year, several models are discontinued.
- Because some are LEs, and that the pieces were all made, lie, to take your example, the Diving GMT.
- Because there is some room to make for new products ( this year was a blast, with a lot of new pieces ), or for the collection to come, in next January.
It may be well the case of the Reverso Grande Date, which had a long life, and, as you know, next year will be a rectangular year!

Best,
Nicolas