Family just finished a study of 2 Peter and it does say that this world will be destroyed by fire as the old world was destroyed by water, making room for the New Heavens and New Earth. I think the New Creation has been inaugurated as it says in 2 Cor 5:17, but we are awaiting the full consummation of that new Creation, as Christ is the 2nd Adam and takes dominion over the New Creation they the spread of the Gospel. It does seems to be a gradual process, so there's something going on there.