In a short tournament like the Olympics an established pair like Keith & Seabrook is valuable. Simply the way they work together rather then adjusting to a new linemate. You want that on @ least 1 pairing.
Weber & Doughty are probably givens somewhere in the pairings but the rest will have to play themselves onto the team.
I think Doughty, Pietrangelo, Weber and Keith are locks. Then there will be some competition for the last few spots. Trying to project ahead a bit, I'd go with Burns, Seabrook and Letang, but a lot can change. Myers and Subban should be right up there as well.
Even though Duncan Kieth had a good Worlds this spring, im still not sold on his play this year, and thinks its a sign he will be getting worse. From my viewings of Chicago this year I liked Seabrook a lot more, and was impressed by how much better he has become with the puck.
I think PK has a good chance... I really think Dion Phanuef is not being looked at by the fans too much. He was really liked in 2010 and if it wasnt for legends like Pronger and Nieds then you would have had Phanuef.
Phanuef is use to Olympic ice size, he has a gold in 2007 and yzerman and babcock are high on his performance.