In the wake of their heartbreaking loss to the Giants, the Patriots now look ahead to the opening of free agency in March and the April draft. As is the case every year, there will be considerable changes. The Globe's Mike Reiss examined all of the big roster decisions the Pats will need to make this offseason, and we picked 10 of the most pressing. (Text by Mike Reiss, Globe Staff, and Gerry Brown, Boston.com)