According today's Watchtower, all the remaining ones of the anointed ones will be in heaven when the Great Tribulation breaks to join Jesus in the battle against evil. The Watchtower was making the point that at that time God's organization will be ran by members of the 'other sheep'.
It didn't say how these remaining ones find themselves in heaven, but presumably they will be taken, i.e. rapture, which is defined as:
The rapture is an eschatological concept within Christianity, particularly within branches of American evangelicalism, consisting of an end-time event when all Christian believers who are alive, along with resurrected believers, will rise "in the clouds, to meet the Lord in the air."
Not quite that definition, as to fit in with previous failed predictions, they believe that those of the 144,000 who had previously died were resurrected in 1918 (not sure if 1918 or 1919, my JW theology is a bit rusty now).
It's just as they believed in 1914 when Russell and Co. thought they were going to meet Christ in the clouds, but of course 99% of Witnesses today won't even know about that.