Patriots starting RB?

Who will start at RB this year for the Pats? It will probably be Green-Ellis, considering he had a 1,000 yard rushing season last year. But will he be an every down back. The pats are usually known for mixing up the backs with 2 or 3 getting equal amount of carries. But will Green-Ellis change this? And what kind of year do u think woodhead will have and if he has any fantasy football value?