Canada called on Sidney Crosby, just to let him know he could come to Germany and play with them in this year's World Championships (an event Jaromir Jagr, Steven Stamkos and Alex Ovechkin are participating in, among others). It's been a very long season for Sid, and he's played a lot of hockey the past couple years, so he's declined to make the long trip.
Chalk that up as a good idea, Crosby's got nothing to gain from the WC's, he's better suited to rest and recharge for now before getting a full summer of training in preparation for next season.
Reports are Canada may be looking to add a forward from Pittsburgh though, with Jordan Staal, Max Talbot and Tyler Kennedy all listed as possibilities. I doubt Staal will go, especially with his foot injury, but perhaps a player like Max or TK could represent their country.