I haven't seen this listed officially anywhere, but according to this post at the HF Boards, Johnny Boychuk has been recalled. It's a tad curious, as it leaves the team with 8 defensemen and 13 forwards. One of those forwards is Cody McCormick, who missed the last game due to injury. Another is Scott Parker, who might as well have an "in case of emergency, please break glass" tattoo.
I guess it's conceivable that Boychuk would play forward (am I imagining that he did that in the preseason?). In lieu of that, this seems an awful lot like there's an as-of-yet undisclosed injury to a defenseman. I'd suggest there's a trade in the works, but that doesn't seem very likely with our current tortoise regime.