I'll specify SWoT & AoT since these are what most of the pre-Epoch calendar class current players have. Their skills seem outdated even compared to the non-special classes. Will they ever have a revamp? Their animations are very cool but the skills seem not enough for real challenges like the Inn at the Edge of Time.
It's been said that old calendar classes won't be revamped, as that would be wasting a profound amount of development time on content that only an extreme minority of the playerbase will have access to. SWoT in particular is also already one of the strongest classes in the game and one of the very last things that needs a revamp.