Ted:
Not all of Israel will be saved, but only a remnant; not all will be destroyed, but some will be chosen to inherit the mountains of God in Israel (Isaiah 65:8,9).

A new heavens and a new earth is yet to be created (after the Millennium has been completed), and everything about this present universe will pass away and be forgotten (Isaiah 65:17; Revelation 21:1). Never again will there be weeping, crying, mourning, or pain (Isaiah 65:20; Revelation 21:4).

"Before she goes into labor, she gives birth; before the pains come upon her, she delivers a son. Who has ever heard of such a thing? Who has ever seen such things? Can a country be born in a day or a nation be brought forth in a moment? Yet no sooner is Zion in labor than she gives birth to her children" (Isaiah 66:7,8). That is, before Israel is born as a nation, whose God is the Lord (which will happen at the end of the age), Israel delivered a son: Jesus. Israel will be (re)born in a day, and the nation will be brought forth in a moment. When Jesus, Israel's Messiah returns, a remnant (children) of Israel will be "born" into an everlasting covenant with God.