Then perhaps you can explain this verse:
13 But based on His promise, we wait for the new heavens and a new earth, where righteousness will dwell.*
If Is. 65 & 66 are not the basis for the New H&E, then where is the promise Peter is referring to found?
The promise is definitely a physical return of Christ, imo, which has not happened yet, but will. Pulpit commentary gives some suggestions:
It is difficult to harmonize the various passages of Scripture which touch on "the new creation." In one place (Act_3:21) it is called an apokatatasiv , in another (Mat_19:23) a paiggenesia . Sometimes its scene appears to be the present world purified (Isa_2:2-4); sometimes an entirely new world created for the habitation of God"s people. (Isa_65:17, Isa_65:18) Perhaps the best explanation is that of Delitzsch, that there are to be altogether three worlds, or three ages.
1. The first age, or ordinary human life, as we have hitherto known it a checkered scene of sin and holiness, of happiness and misery, of sorrow and rejoicing.
2. The second age, or the period of the millennium, in which "the patriarchal measure of human life will return, in which death will no more break off the life that is just beginning to bloom, and in which the war of man with the animal world will be exchanged for peace without danger.
3. And the third age, or a final state of happiness in heaven; or the heavenly Jerusalem, when death will be destroyed, and sin will be no more, and tears will be wiped from all eyes, and the former things will be passed away altogether. (Rev_21:4) The three ages are distinctly marked only in the apocalyptic vision of St. John the divine. (Re 20 Re 21) Isaiah and the other Old Testament prophets have an indistinct view, in which the second age and the third age are confused together, the characteristics being chiefly those of Age II, but some of the characteristics of Age III being intermingled. Age I and Age III are common to all the redeemed. Age II will belong only to a select few souls of them that were beheaded for the witness of Jesus, and for the Word of God, and which had not worshipped the beast, neither his image, neither had received his mark upon their foreheads or in their hands," who will "live and reign with Christ a thousand years". (Rev_20:4)
Vers. 17-25. The new creation.
It seems that the leading thought of the prophet is the transformation of nature in harmony with the changed nature of man. Its grandeur needs not to be pointed out. Ordinarily, indeed, we think of man"s dependence on nature. If the thought be pushed to its limits, it ends in materialism. Spiritual religion, on the contrary, sees in the changes of nature a human pathos; its waste and desolation the effect of human sin, of violated Divine laws; its flourishing aspect and fertility the effect of human obedience and true religion. (cf. Isa_11:6-9 Isa_30:26 Isa_43:19 Isa_51:16) Upon the difficult interpretation of such language much difference of opinion naturally arises; but it is open to all to catch the inspiration of the thoughts.
I THE DIVINE EXULTATION ON THE NEW CREATION. It Was said of the Creator at the beginning that he looked with complacent joy upon his works. All was very good. It was the "joy of God to see a happy world." How much deeper the Divine complacency in moral renewal! Note the emphasis and iteration of the thought. Rejoicing, exultation, is the very key-note of the passage; weeping and the sound of crying is to be as unheard as at the gayest scene of festival. And may we not feel that beneath all the sadness, the discord, the gloom of this enigmatic world, the prophetic pulse of the Divine creation, love, is ever exultantly beating? May we not believe that there is ever before his eye the picture, rising to clearness of outline and brilliancy of colour out of Erebos and Chaos, of eternal day, of the new heavens and earth wherein dwell righteousness? There should be in every heart a prophetic sympathy, which should vibrate in unison with these oracles of God.