My guess would be Anderson since he was given the shot over Brown in the past, but I am most intrigued by seeing Idonije on the outside. I never really liked him lined up inside last year so I'm curious to see what he can do on the outside.
And as for the Tommie Harris talk, I agree that the notion of having Peppers there will help out Tommie is in reverse. Elevated play from Tommie will make Peppers' job a lot easier. But, what this discussion makes me think of again is why have the Bears still not gone out and gotten a big DT to put next to Tommie. He has never played at the level he did when he had a big guy like Tank Johnson next to him. I know cover-2 calls for smaller guys but Jesus, does no one in the organization realize that we never got as much pressure on the QB as when we had Tank Johnson occupying blockers on the line. Go out and get a bigger DT to put next to Tommie JA!