1: That we choose them later as in Oblivion.
-or-
2: That Birthsigns as we know them are out.
However, I also had the thought that maybe at the beginning, or perhaps your first level up, the first set of perks you choose from would be the Birthsigns. Frankly I like this idea, as it would be a good way to introduce the perk system when we haven't had a lot of time to decide which way we want to go and what to focus on. Does anybody else have a thought on this?