Yes, it is true. Informal nights will be discontinued on HAL ships. My DH always wore a jacket on Informal nights (with or without a tie) but my clothes for Informal and Casual really are quite alike. Won't make that big a difference for me but I'm sure it will be a license for some people to take even less care with their dress in the evenings.
Always a few in every crowd.......whaddyagonna do?