They've said a week at least, so I'm guessing that it's nothing major or they'd not be saying that. The big stuff they try playing close to the vest, or they're outright honest about it (Crosby's high ankle sprain, etc.).
The Penguins are simply riddled with injury, so it's really astonishing they've accomplished what they have... Malkin's a big help and proven he's a top NHL player I think, plus a leader and 2-way player. Great news for us. The other key's been Conklin who's proven he's a top goalie I think...
There's been a ton of injuries though, and as a fan it's just tough to watch. Eaton's one of your top Defense, he's gone... Roberts has played pretty well when we've had him, but he's been gone for a while (plus he's tons of leadership you've lost too). Crosby obviously, Fleury obviously, and the list goes on really...
I think Hossa an outstanding pick up, don't get me wrong, but I think Armstrong was a lot of player to give up... They should've sweetened it with draft picks and a young prospect or something. Just something else... Armstrong's a pretty beloved guy around here.

Anyway, they beat Atlanta today, a good (and needed) win to go ahead of New Jersey again... Been a rough couple weeks watching them though here. Just bad playing all around. Blah. And today's game was ugly from an officiating standpoint... That's been getting into playoff mode I've noticed. Double blah.