Now I saw a new heaven and a new earth, for the first heaven and the first earth had passed away....Then I, John, saw the holy city, New Jerusalem, coming down out of heaven from God, prepared as a bride adorned for her husband. Rev 21:1-2
According to the commentary in The Orthodox Study Bible "The Holy city, New Jerusalem is the city build by God. It is the perfected Church, the bride ready for her husband, Christ, the abode of the righteous eternally. The OT prophesied a restored and exalted Jerusalem."
In a nutshell, I think this sums up pretty well the theology regarding the "promised land."
Fr Deacon Paul