Nothing specific on the injury (the usual "upper body" business), but Blake does have his left arm in a sling and mentioned having shoulder surgery before. I'm sure if he needed to go under the knife he would have already, so there's no need to worry about this ending up there.
[UPDATE] An email from AHL broadcaster Eric Lindquist tipped us off on this one, and expect to see it on WTC (it's there now) as the day progresses. Both Couture and Ferriero were sent to Worcester, so it leads us to believe that one of Mitchell, Vesce (H/T cerise) or Setoguchi is ready to return to action. On a side note, it seems that McGinn has impressed more than just Plank and I in his recent NHL stint, as he'll be staying up while Ferriero is sent to the AHL for the first time this year.