I am almost 100% shore it will be through the Saints Row community site like it is now. You will download and upload your characters same as it is now. It will have nothing to do with your save file.
But from the little they have shone from Saints Row 4 the new character creator is almost exactly the same just with more options. So if you remember what you did it will be easy to just make your character again.
Gamer Tag: JasonPogo And since experience has been the mistress of whoever has written well, I take her as my mistress, and to her in all points make my appeal