From the WTS website:
Do they believe that they are the only ones who will be saved?
No. Millions that have lived in centuries past and who were not Jehovah's Witnesses will come back in a resurrection and have an opportunity for life. Many now living may yet take a stand for truth and righteousness before the "great tribulation," and they will gain salvation. Moreover, Jesus said that we should not be judging one another. We look at the outward appearance; God looks at the heart. He sees accurately and judges mercifully. He has committed judgment into Jesus' hands, not ours.? Matthew 7:1-5 ; 24:21 ; 25:31 .
I was in the "troof" for 30 some years and I got the distinct impression that anyone not associated with God's earthly organization(read the WTS or JWs) would be destroyed at Armageddon. Isn't it heartwarming to know that the WTS is finally committing our judgement into Jesus' hands?