From the Globe & Mail, an anonymously sourced bombshell:
The word filtering out of the Pittsburgh Penguins is that Crosby is an angry young man, angry enough to pull his considerable star presence from one of the league's showcase events because he does not think the NHL is doing enough to protect its players. An NHL source said Crosby is not likely to tell the NHL he is withdrawing from the all-star game to protest the fact neither player who hit him on the head was suspended. However, he could easily decline and cite the need for complete recovery from a mild concussion.
The source said Crosby, who showed up at the all-star game in Montreal two years ago even though he sustained a knee injury and could not play, is not inclined to do any more such favours right now