Are there plans for challenge dungeons or dungeon progression?

[Llus]

I always thought that 'mythic dungeons' and the progression system from a certain other MMO was always a brilliant idea and a really good incentive to keep people gearing and trying to reach higher levels (which in turn gets them better stuff, possibly.)

With FFXIV lacking reasons to gear up properly once you've done the content, this would be a good idea no? Anyone know if such things have been discussed or are in the works?

That's what the savage content is for. Personally I'd prefer the dev team spends time on making raids vs going back through all the light party content to add convoluted system for getting gear. If you're wanting something besides tome gear and can't get the omega gear, the 24 man raid will be dropping in the next patch.