There's a half-page ad in today's New York Times placed by AA flight attendants saying they could go out as early as July 1.
On the other hand, President Dubyuh has said that he's not going to allow any airline strikes this summer. Whether he really has the power to prevent them seems open to some question.
Since you're booked before the earliest threatened date, it's pretty sure you'll get to fly over OK. If, by the time you return, there's a strike in progress, AA will have made arrangements for others to honor tickets. You can have the purser get work on getting you alternate flights during the cruise if it comes to that. You won't be alone.