USA Hockey announced today which players would be attending their summer evaluation camp in Lake Placid, New York. You can view the list of the 44 invitees here.
It's of course still possible for a player not invited to make the team if they got off to a great start to next season, but that's certainly the exception, not the rule. The large majority of next year's team will come from this camp, which is good news, since there is a pretty solid group of guys there.