Thank you so much for the comment, I'm glad you liked it!
There will be a final tier of hero classes added at some point (probably not for a while), meaning there will be 4 final classes for each base class.
The guilds currently have a randomized bonus stat(s) that the heroes of that guild receive and it goes up as the guild gains more renown. I do think this system is a bit shallow and could be expanded on.
Different races isn't very likely, as the different models for each class/race combo would be outside the scope of what I can probably manage. But I do think there's a lot of room for expanding the renown system to serve a similar purpose and I will keep this in mind for future updates!