Is it not possible to roleplay that your character was? Besides a few stats and spells, I don't see what birthsigns really offered in terms of gameplay.
Why can't you include a birth sign into your backstory. I don't get. Backstories aren't "real" gameplay elements anyway.
True but ultimately this will make my roleplay weaker as the game will not react to the fact I have chosen a specific birthsign. I'd have to pretend it was relevant and that characters cared when none of them would. The reason I don't go full pen-and-paper is because I have to act out a lot more and work out every character interaction. The game is meant to take over most of that work for me so I can focus on being the character alone.... but now this... I am shocked.
Birthsigns aren't in but guardian stones do something similar (note: They do not replace them I know, before I get flamed). So far the three shown are based on three of the constellations from past games which give level specific skills quicker. These though are apparently the three basic ones, one previewer mentioned one which raised maximum health and I wouldn't be surprised if there is a guardian stone for each constellation.
If there are only three I will be very disappointed. If I do, however, discover the Shadow stone... my character will pray to it every week (or every day it is in alignment).