I was wondering if their is currently a max Rank? If there is a max Rank, What is it?

Assuming there is a max, do you think Ubi will eventually add more Ranks or Tiers? or do you think having a max Rank set in stone would encourage players to eventually use and upgrade other heroes?

I personally have a favorite hero that I will continue to use for the foreseeable future, but when or if I reach a cap, I MIGHT consider levelling up another hero.

I've seen purple and blue tiers in the beta, and have heard of legendary, but never seen it.