I am really hoping Larian will include a bigger quest line (depending on the background and the race tags like Balduran/Underdark/Planar) that better incorporates the custom heroes into the game world. It would be awesome if we could actually meet people in Baldurs Gate who recognize us and have pre-existing relationships with us.
If they'll restrict the number of possible custom origins into Baldurian/underdark/planer it is more than possible to have a compelling story line for custom characters. But if I had to guess I'd say not a chance. The word "restriction" is a dirty word in Larian studio.
