Isaiah 43:5-6-
Do not fear, for I am with you;
I will bring your offspring from the east,
and from the west I will gather you;
6 I will say to the north, “Give them up,”
and to the south, “Do not withhold;
bring my sons from far away
and my daughters from the end of the earth—
Ezekiel 37:26-28-
I will make a covenant of peace with them; it shall be an everlasting covenant with them; and I will blessthem and multiply them, and will set my sanctuary among them forevermore. My dwelling place shall be with them; and I will be their God, and they shall be my people. Then the nations shall know that I the Lord sanctify Israel, when my sanctuary is among them forevermore.
Isaiah 2:4-
He shall judge between the nations,
and shall arbitrate for many peoples;
they shall beat their swords into plowshares,
and their spears into pruning hooks;
nation shall not lift up sword against nation,
neither shall they learn war any more.
Zechariah 14:9-
And the Lord will become king over all the earth; on that day the Lord will be one and his name one.
No, there doesn't need to be any fulfillment of 'NT' stuff, because that presupposes that Jesus is Messiah, which he's not. Also, if you'd read any of the book of Ezekiel, you'd know that the Temple is a real, material structure. The book of Ezekiel describes people bringing offerings to the future Temple and even gives the specific layout. The book goes into minute detail describing the Temple.