What will the church in Philadelphia get for overcoming?

Jesus will write on them the names of his God, his God's city (new Jerusalem), and Jesus's new name

to the angel of the church in Philadelphia write ...

Him that overcometh ... I will write upon him the name of my God, and the name of the city of my God, which is new Jerusalem, which cometh down out of heaven from my God: and I will write upon him my new name. Revelation 3:7,12