BE VERY CAREFUL WHEN PRETERISTS BEGAN USING THE WORD THEREFORE, BECAUSE YOU KNOW A HUGE ASSUMPTION IS COMING.
Donny : The fulfillment is the entrance of Gentiles into the new covenant and full establishment of the new covenant. The new covenant, however, could not be fully established until the old covenant (including the Temple) was destroyed. Thus we find a 40 year transition period. This explains the "already, but not yet" attitude of Paul and other writers. Salvation was there, but not there. Righteousness was there, but not there. The New Covenant had been inaugurated, but not fully founded and culminated.
"Paul cites Isaiah 11:10 (Romans 15:12) speaking of the spread of the gospel to the Gentiles and as a present reality. Isaiah 11:10 is the ending of a passage about the new heavens and new earth (Isaiah 11:6; cf. Isaiah 65:17-25), therefore the new heavens and new earth were a present reality to Paul. In Revelation 21:1, the new heavens and new earth are spoken of as coming in as the old heavens and old earth fade away (cf. Hebrews 8:13). However, final judgment is shown as happening as the old heavens and old earth fade away, also (Revelation 20:11). Therefore, final judgment must be a past event. If final judgment is a past event, then death and Satan have been defeated and conquered (Revelation 20:10, 14). If this is a hard idea to swallow, consider that this is repeated in the gospels and epistles (Genesis 3:15; Matthew 12:28-29; Luke 10:18; John 11:25-26; 12:31; Romans 5; 16:20; Hebrews 2:14; 1 John 3:8; Revelation 12:9-11). It also echoed in 1 Corinthians 15:54-55, which states that the sting of death sin and the power of sin is the law. Paul repeatedly claims that we have been released from the Law and no longer under it (Romans 7:6; 2 Corinthians 3; Galatians 3:13, 24-25), therefore the power of sin is gone. If the power of sin is gone, then the sting of death is gone and death is conquered. Although the prophecy states that there will be no death, merely reading Isaiah 65 will reveal that there is death. Death is conquered in that it no longer hurts us in light of Christ (John 11:25-26). Therefore, if death is conquered, both the millennial reign (1 Corinthians 15:24-26) and the resurrection (1 Corinthians 15:50-58) have happened. Further proof of this is found in the fact that New Jerusalem (Revelation 21) is the church. Notice that both are the bride of Christ (Ephesians 5; Revelation 21:2) and both are founded on the apostles (Ephesians 2:20; Revelation 21:14). Since Christ is obviously not a polygamist, New Jerusalem must refer to the church. We can also see that the new heavens and new earth also are images of the church because both New Jerusalem and the new heavens and new earth involve no mourning or crying (Isaiah 65:19; Revelation 21:4). In Revelation 21:4, death is shown to be gone. Because of Christ, we have life and death is defeated with no power over us."
http://www.christianguitar.org/forums/archive/index.php/t-37588.html