MeAm Lo'ez

43:1  Despite G-d's reason for exiling the Jewish people, (ch.42), He now reassures them that they will be redeemed.  He reminds them how He redeemed them from Egypt and how He proclaimed to the world that they are His - He will redeem them again in the Future as He redeemed them in the past.  G-d also reassures them that He has not exchanged them for another people which will become the "new" Yisrael, for only they are the children of Yaakov-Yisrael, whom He has called His people by name.