These are three buzz words in my vocabulary...perhaps if you attend Grace you have likely heard these come out of my mouth a lot. I think in short it is because as I look at the overarching message of Scripture, God's Glory through Redemption is a large theme. As sub-themes under that for me would be these three words: Kingdom, Covenant, Renewal.
Kingdom- The overarching reign of the Sovereign God over all things which has never ceased to me and which Christ continually said over and over is here...now. (hence my view on the end times- Ammillenialism).
Covenant- God's arrangement of grace with His one people through a series of lesser covenants (works, Noah, Moses, David, New Covenant, etc.)- All of which are steadfast promises by a rock-solid God to a shaky and utterly sinful people.
Renewal- That which God is doing through the coming of His kingdom in covenants. In fact, not only is God making all things new (Rev. 21:5), in addition to human souls, God is renewing cities, and cultures, and the earth (2 Peter 3:10-13) I believe is clear on this...God is not going to just "blow up the earth" and start over, nor are we going to see earth burn and float on clouds playing harps in heaven...no, God is renewing all things. In translation in the ESV of 2 Pet 3:10 is helpful here as the phrase is that works will be exposed, not burned. The Greek word used for "new" (-2 Pet 3:13 kainos) signifies a more renewed vs. completely new, young. I believe as Revelation 21 makes clear that the new heavens and the new earth will be a merging of where God is now with a renewed earth...Eden on steroids if you will...and does this not utter our prayer now, "Our Father, Who Art is heaven, Hallowed be Thy Name...Thy Kingdom Come, Thy Will be done, On Earth as it is in Heaven.
Our prayer is a harbinger of things to come...Kingdom, Covenant, Renewal...and the Gospel is the centerpiece of it all.