The gospel is the fulfillment of the Promises

Isaiah
65:17 For, behold, I create new heavens and a new earth: and the former shall not be remembered, nor come into mind.
65:18 But be all of you glad and rejoice for ever in that which I create: for, behold, I create Jerusalem a rejoicing, and her people a joy.
65:19 And I will rejoice in Jerusalem, and joy in my people: and the voice of weeping shall be no more heard in her, nor the voice of crying.
65:20 There shall be no more thence an infant of days, nor an old man that has not filled his days: for the child shall die an hundred years old; but the sinner being an hundred years old shall be accursed.
65:21 And they shall build houses, and inhabit them; and they shall plant vineyards, and eat the fruit of them.
65:22 They shall not build, and another inhabit; they shall not plant, and another eat: for as the days of a tree are the days of my people, and mine elect shall long enjoy the work of their hands.
65:23 They shall not labour in vain, nor bring forth for trouble; for they are the seed of the blessed of the LORD, and their offspring with them.
65:24 And it shall come to pass, that before they call, I will answer; and while they are yet speaking, I will hear.
65:25 The wolf and the lamb shall feed together, and the lion shall eat straw like the bullock: and dust shall be the serpent's food. They shall not hurt nor destroy in all my holy mountain, says the LORD. 

Revelation
21:1 And I saw a new heaven and a new earth: for the first heaven and the first earth were passed away; and there was no more sea.
21:2 And I John saw the holy city, new Jerusalem, coming down from God out of heaven, prepared as a bride adorned for her husband.
21:3 And I heard a great voice out of heaven saying, Behold, the tabernacle of God is with men, and he will dwell with them, and they shall be his people, and God himself shall be with them, and be their God.
21:4 And God shall wipe away all tears from their eyes; and there shall be no more death, neither sorrow, nor crying, neither shall there be any more pain: for the former things are passed away.
21:5 And he that sat upon the throne said, Behold, I make all things new. And he said unto me, Write: for these words are true and faithful.
21:6 And he said unto me, It is done. I am Alpha and Omega, the beginning and the end. I will give unto him that is thirsty of the fountain of the water of life freely.

Revelation can't be talking about the new heaven wherein we have perfect bodies and sin no longer because of the invitation in verse 6: come! If you thirst, if you hunger, if you are meek and seek strength, if you are persecuted and need a refuge, if you are tired and need rest, come! That's the gospel message. Therefore the idea of a new Temple must be of the Spirit within our hearts, and the security must be the one God provides to us as believers in Him.
But look how it was foreshadowed in the OT to Israel, who was a physical model of the spiritual reality: a perfect existence where the animals would not fight, nor would creation kill. It's the perfect subdued land that has submitted fully to God. The imagery of the animals is realized as the gospel invitation. Come, for God is making all things new.