There will be something like this to work with.
http://media.chroniclesofelyria.com/concepts/e1de104c80594ecc8fb8412fd83e77b2.jpg
And relevant dev journal
https://chroniclesofelyria.com/blog/620/DJ-8-Character-Roles-and-Skill-Advancement
There will be something like this to work with.
http://media.chroniclesofelyria.com/concepts/e1de104c80594ecc8fb8412fd83e77b2.jpg
And relevant dev journal
https://chroniclesofelyria.com/blog/620/DJ-8-Character-Roles-and-Skill-Advancement
The limits for each character will be based on the tribe, but the stats will be a spectrum. CaptainWillCockerham's post has the links for it
Oh hey there
Don't confuse the skill groups for the stats! For the attributes (aka the stats) you will want to read this wiki page.
As for the attribute foundation I believe there will be some base values according to race that will have variations according to a characters genetics; in other words not every Brudvir for example will be equal. I don't know if anything more specific have been said on the subject though.
Stats will also rise and fall based on what you end up doing in the world. If you spend all day chopping wood you'll be strong but your intelligence will not be good. If you just run all day your stamina will be good but your other stats won't be. Being a bookworm will raise your intelligence scores but you'll be weak. So tribes aren't so much about setting up your permanent stats as much as they are about changing your min/max range for a stat along with changing how quickly you can gain ground in a particular stat.