They are late. If they had followed their previous patterns from recent years, they would be out by now. They typically are the first North American major cruise line to announce their new itineraries. So no one can give you a definitive answer. You can Google past announcements to see what I mean. For example, this one from Dec 2022, I was expecting a similar announcement in Dec 2023, but there wasn’t one.
https://www.ncl.com/newsroom/norwegian-cruise-line-unveils-winter-202425-and-summer-2025-cruises-in-europe-caribbean-and-alaska