NOt in pool play. If it happens it will happen in the medal round, which starts Jan. 2. If the US and Canada finish first in their pools, they wouldn't meet unless they both make it to the gold medal game (or the bronze medal game if both lose in the semi's).
The medal round brackets will be set tomorrow following the US/Russia, Canada/Czech, Finland/Switzerland, Sweden/Slovakia games.
The Rangers web site has a good page on results, standings and game schedule.
The Canadian TV shedule shows the Quarterfinal #1 game televized, which would match A2 against B3 on Jan 2 (if the US loses to Russia, they would be A2).
The US could also meet Canada in a semifinal game if one of them finishes second in their pool.