2013 Edition (Source - jw.org)
12 Jesus’ prophecy about the last days reveals that he will for the very first time act as Judge of all nations after the destruction of false religion. As mentioned in paragraph 8, some of the events that will occur during that time are recorded at Matthew 24:30, 31. When you examine those verses, you will note that Jesus there foretells events that are similar to the ones he mentions in the parable of the sheep and the goats. For example, the Son of man comes with glory and with angels; all tribes and nations are gathered; those judged as sheep “lift [their] heads up” because “everlasting life” awaits them.
13 So, then, what can we conclude? Jesus will judge people of all nations as sheep or goats when he comes during the great tribulation. Then, at Armageddon, the climax of the great tribulation, the goatlike ones will be ‘cut off’ forever.
2015 Edition (Source - jw.org)
“The sheep” and “the goats” represent individuals from all nations. These ones are not anointed by holy spirit.
And what of the reason why people will be judged as either sheep or goats? The outcome hinges on how they have treated the remaining ones of Christ’s spirit-anointed brothers on earth.
He [Jesus] describes the sheep as “righteous” because they recognize that Christ has a group of anointed brothers still on earth, and the sheep loyally support the anointed during these critical last days.
The growing number of prospective sheep count it a privilege to support Christ’s brothers not only in the preaching work but also in other practical ways. For example, they give financial contributions and help to build Kingdom Halls, Assembly Halls, and branch facilities, and they loyally obey those appointed by “the faithful and discreet slave” to take the lead.