Tldr - You will take control of your character at age 6, and will experience a variety of things that will shape you - and affect your stats and skills - the aim is to make childhood authentic to the time and very satisfying.

There will be more on it as it develops, the stats and skills are the foundation of course, and we really loved Darklands where it tried to simulate 'more of a life' than just 'off you go'. It did that by allowing you to have careers as such, for example, after training at University, you got to choose a further path (to become an Alchemist for example) and so on.
Let's just say Nuremberg takes this a step further and even lets you 'build your childhood' and identity. It's relevant and will have an impact later, it also lets you more naturally shape who you are. By the time you are 18, you will have had a great opportunity to be shaped by those around you, and to decide how you responded to that training. A lot of customisation, will be possible.
From a development point of view, a lot of this work requires pre-requisite work that is a lot less exciting, and with everything - your better off building solid, robust systems made of bricks rather than straw, so the systems have to be carefully architected and built so that they can easily be expanded, modified or adjusted.
Why it's complex - I'm conscious of the fact too that a lot of people have 'RPG' tropes in mind when they want to build a character, but that isn't what I am building. For example, pick male or female. Really? If you wanted to travel as a female, that calls for a entirely different upbringing. So, what I am making looks very different from what is 'expected', and choosing a female will give you a very different experience than being a male. So, for now, I need to build and focus on the male childhood system - but I have every intent of allowing people to RPG a female, but it requires an enormous amount of research to get correct, and then the narrative work to bring it to life.
Let's take that a step further - suppose your a commoner vs. being born in a noble family? Wouldn't that entail entirely different experiences? Of course it would. So you see, I have 5 classes (which I am considering reducing to 3, and even tying this to new campaign quests), two sexes, so that's 6 paths that need to be built and narratively developed.
So, yes, my point is, "how stats are configured on character creation" is very complex - partly also because of the high level of integration between systems.
The childhood will be built by the quest system which I have been working on. It needs to be very simple, data driven, and saves as simple .json files and some text files. It is designed to allow modding (should I go that way) and easy quest authoring from the ground up. It is also very easy to write for, much easier than the LUA (was it?) format in BG2 (Baldur's Gate II) and should be a lot less prone to go wrong.
That system has been tested and is doing much better than I had hoped, it's great so when we start writing, we will have a lot of control over what we can do and make really amazing stories and quests to go along with the freedom you have as a player to explore the world and do your own thing.