He's also coming to establish His everlasting Kingdom on this earth and throughout the universe (1 Corinthians 15:24-28). We have absolutely no idea what it will be like when the whole universe is permeated with God -- His holiness, His righteousness, and His light -- *THAT GOD MAY BE ALL IN ALL*
Believers will have responsibilities in this everlasting Kingdom -- we shall live and REIGN with Him (1 Cor. 6:2-3; 2 tim. 2:12). Also, David's throne will be established in the New Heavens and the New Earth (Ezek. 37:20-28).
Luke 16:16. The law and the prophets were until John: since that time the kingdom of God is preached, and every man presseth into it.