Per the Wild's twitter:
He's back on the ice! Derek Boogaard has rejoined the team after a concussion.
Look for the Wild to not add anyone to the roster today, since they don't play until Wednesday, and they don't want to take the cap hit until then. After that, I would assume Hilbert, Kalus, Gillies are on the shortlist.
So, not only did the first week go horribly for the team in the record column, but now they're laid up as well. Lovely.