CC Deconstruted, a very good information giver on Castle Clash has released hero rolling chances. I think that we should put these rolling chances on the hero's pages, or stats. Whichever is preffered. For now, I'm putting the rolling chances on the Notes part of the hero.
There's a website ( http://en.casclash.com/get-heroes/ ) that shows the rolling chances according to the disassembled apk, though not 100% sure how credible it is considering IGG hasn't confirmed it (and probably wont), and the fact that this is the client side data, when rolling should be server side..