They don't have one. Bellichek is going to be doing the play calling from what I understand. How much are the Pats going to miss Weis and is having your Head Coach who is a D guy going to make your O suffer?
How will this effect Dillon and Brady? I think Dillon will get worked more and Brady less but that is just a guess.
I know the Pats experimented with having Brady do signal calling like Manning does last year. I don't know if they felt it was a success or not, but its a possibility they could increase Brady's role in calling the play since they haven't gotten an OC. Just a thought.