@Hugrf
You most definitely will be able to create your fursona due to the fact there will be 2 options for creating a character: Realistic or Mythical. By checking Realistic, you will get limits and certain colors depending on animal, like only scaling the creature's body parts to a certain level, only proportional to the size of its body.
By checking mythical, you will get waay more freedom in creating a character. For example, wolves, deer, et cetera will have the option of wings and certain powers. Dragons & gryphons will get more power and options, too.
As for game rating, it will not have an exact rating. The game is meant for people mature enough for some blood and gore, like in hunting and fighting other players. And, of course, you will have to ask players for permission in order to battle or fight one another.
And for concepts: Concepts for the game. This part is the most difficult since there is only an independent developer so far (me). When the forum and the website come out I will hire some modelers, skinners, coders, moderators, administrators, et cetera, to help me get through the difficult process.
Now, hopefully, the game will be out in 4 years or less. Due to the complexity of the game, it will take such time to make it all fit.
NOTES: The Realistic & Mythical options probably won't be out in the first release of the game, along with some species. The 1st release will not be out in a while because I am still awaiting my new computer. This one is horrible.