I haven't decided yet. Before I can know I need to know...
1. If there are going to be any unexpected classes or subclasses added.
2. If there are going to be any unexpected races added.
3. What companions will be in the game at launch.
4. Will companions be class locked.
5. What will all of the origin options be? Because if a particularly awesome origin character comes out - I may play as them in my first play through. So far none of the available ones would appeal to me over Tav though. I actually tend to prefer this route (as an example I think playing as Geralt in The Witcher and Kratos in God of War is a lot more interesting than build-your-own)... but none of the origin characters come off as that amazing to me. They seem great as companions and to learn about - but not to play as.