The post has come today and there was no new season ticket card there. I can't understand why the club have left it so late. I'll update again after the postman visits tomorrow.
https://www.brightonandhovealbion.com/news/2017/june/new-season-cards-for-season-ticket-holders/
Exciting news if for no other reason than the club will surely send them out very late, leading to many not arriving in time and monster ticket office queues at the first home game of the season...