According to the Star-Tribune, both Bergeron and Foster are practicing, and MAB hopes to play tomorrow against the Coyotes.
While MAB's return will help from an offensive/PP standpoint, he's just brutal defensively. Hopefully he does more in the opponent's zone than in ours.
And Foster, I know this is going to sound harsh, but keep in mind he's not a very good defenseman to begin with. When he got hurt, he was playing his best hockey of his NHL career. But he's pretty much just a bigger Zidlicky: big shot, questionable-at-best in the neutral and defensive zones. Even assuming he comes back and quickly gets back to where he was when he got hurt, he's still basically a fourth option on the 3rd pair (with Skoula, MAB and Zids) and a second line PP guy.