I don't think that it's overly difficult to guess what Hockey Canada would pick other than a small number of slots. Just look at the NHL World Cup team and replace a few players. Assuming no injuries, I think that Hockey Canada would go with something very close to this:
Marchand Crosby Bergeron
Benn McDavid Seguin
O'Reilly Toews Carter
Tavares Getzlaf Stamkos
Couture, MacKinnon
Vlasic Doughty
Keith Burns
Pietrangelo Weber
Subban, Giordano
Price
Murray
Holtby
I think that 11 of the top 12 forwards, all except O'Reilly, would be pretty much locks. O'Reilly makes it for his versatility, very strong play in the last three World Championships and style of play. Couture makes it for similar reasons, though no WC performances. MacKinnon is 14th forward because I think Hockey Canada would want at least one non-McDavid young guy and I don't think the other top young forwards (like a Marner for instance) have had enough time to establish themselves. I wouldn't pick Getzlaf, but I don't think that Hockey Canada and Babcock would be ready to say goodbye yet.
I think that the defence would definitely have that top six provided Babcock was the coach. I don't think that Hockey Canada would be ready to move on from Keith or Weber. I don't think that Bouwmeester could make it unless Armstrong was the GM, and I think that a deep playoff run would be enough to get Subban on the team. His spot could certainly go to Letang though. Hard to think of who the eighth defenceman would be. Could be a young guy like Ekblad, but I think that they would go with a LHD. I guessed Giordano because I think that Calgary will get off to a decent start this year but really it could have been Rielly or any number of other LHD. I don't think that they would go with Muzzin on larger ice despite his solid performance on big ice in 2015.
First two goalies are easy. Price is the starter, Murray is the apprentice. Holtby is the number three. Could easily be Crawford instead though.
The team that I would pick would be somewhat different. Fewer of the old guard. A lot of this team pick itself though.