Grand Companies to the next level..

[ErikMynhier]

Since the current highest rank gives level 50 rewards, it stands to reason that future ranks will be introduced as they raise the level cap. And Yoshi's said they plan to introduce new jobs when they raise the cap. So new GC ranks, new job(s) and level cap raise should all happen at same time.

Your logic makes me sad. Mostly because it makes sense.