I think Doc will play four guys - House, Tony, Powe, BBD.
He'll likely choose a fifth sub (smallest role of the bunch) which will be one of the three perimeter guys - Pruitt, Walker, Giddens - I thought Giddens was the frontrunner during the summer but now I think it's Walker. Also, POB has shot (I think a small one) at unseating BBD.
I think the big question is does Doc use the first few games of the season to solidify his rotation rather than blood the younger players, like he did last season ... perhaps to get Tony Allen comfortable and confident in his new role.
That's my expectations anyway.