As the forgiveness of sins and the reconciliation to God is central to the gospel and connected to the cross, so also is our future bodily resurrection and entrance into the kingdom at his second coming is equally essential to the gospel. 

These two things should be tied together as "the gospel". The first coming which accomplishes the forgiveness of sins, reconciliation, the indwelling Holy Spirit, and the second coming, in which he raises me from the dead and gives me entrance into the glorious kingdom. 

- Chad Brewer, sermon: The Kingdom of God and Suffering.