The theological term for the end times is eschatology, the study of last things. This includes not only the return of Christ and the kingdom, but also “personal eschatology,” what happens to individuals after death, what judgments await the believer and the unbeliever. I think that the study of the “end times” has mutated into “what is going to happen to those people left behind after the Rapture?” While I do believe in a Rapture / Tribulation / Second Coming scheme, I think it is more helpful to see the overall themes of Revelation rather that try to get ever detail of the Tribulation lined up on a chart.
I want to let Revelation speak for itself as much as possible, and to do that the book must be read in the context of the Hebrew Bible and Second Temple Jewish expectations. John is remarkably consistent with the Judaism of his day, with the exception of identifying Jesus as the Messiah.
The most general teaching of Revelation concerning personal eschatology is that the righteous are to be rewarded and the unrighteous are to be condemned. This is consistent with the Hebrew Bible. When the messianic age begins, there is a judgment of the nations and of Israel. Not everyone participates in the messianic age, as a text like Isaiah 25:6-8 makes clear. While many will gather on Zion to participate in the inaugural banquet at the beginning of the age, Israel’s prototypical enemy Moab will be trampled in the mud (25:10-12). Jesus also described the beginning of the new age as a harvest, where the wheat will be gathered into the barn (where it belongs) and the weeds gathered and thrown on a fire (where they belong). This theme of eschatological separation is common in Jesus’ parables (Matt 13:24-30, for example).
Prior to the beginning of the eschatological age, the Hebrew Bible expects a time of persecution of the people of God. In a book like Daniel, this period of persecution will separate the true Israel from the false. The capture of Jerusalem by the Babylonians initiated a long sequence of conflict with pagan rulers which reached a climax during the reign of Antiochus IV Epiphanies. The struggles of the Maccabean period become a paradigm for future persecutions.
In Revelation, there is a persecution of those who refuse to worship the beast or take his mark. Revelation 13:7 describes this as a “war on the saints” which will result in the death of many who are followers of Christ (13:10, 20:4). This persecution is a time when a choice must be made to worship the beast (taking his mark) or to worship the Lamb. There is no middle ground, the time of great persecution is a sifting of the true followers from the false.
In Revelation 20, there is a judgment at the beginning of the Kingdom of God, or the eschatological age. John’s vision turns to a scene of thrones, thrones for those who were martyred during the tribulation, and thrones for those that endured until the end. In this vision, it is the souls of those who were faithful during the tribulation that sit upon thrones. The souls that John is seeing in these verses are those that were under the altar in 6:9 crying out to God asking to be revenged for their death at the hands of the beast and his kingdom.
With respect to the future, then, Revelation promises that God will judge with justice. Those who persecute will be judged and separated from the Kingdom of God, while those who were persecuted will be vindicated and enter into that Kingdom.