Behold, days are coming," declares the Lord, "when I will make a new covenant with the house of Israel and with the house of Judah, not like the covenant which I made with their fathers in the day I took them by the hand to bring them out of the land of Egypt, My covenant which they broke, although I was a husband to them,” declares the Lord. “But this is the covenant which I will make with the house of Israel after those day,” declares the Lord, “I will put My law within them and on their heart I will write it; and I will be their God, and they shall be My people.
From the quote above God considered His covenant with the Jews broken but in His graciousness was willing to establish a “new covenant” which we know to be the giving of the Holy Spirit. There may be some blessings bestowed upon the Jews but my old mind is at a lost to think what. But certainly nothing after the "new covenent" and this "new covenent" had nothing to do with lost tribes which disappear before our Lord Jesus was on the scene.