45 Or possibly, “let us wait for.” The form in Greek (προσδόκωμεν, prosdokōmen) could be either indicative or subjunctive. The present participle in v. 14, however, is best taken causally (“since you are waiting for”), suggesting that the indicative is to be read here.
46 The relative pronoun is plural, indicating that the sphere in which righteousness dwells is both the new heavens and the new earth.
47 Grk “dwells.” The verb κατοικέω (katoikeō) is an intensive cognate of οἰκέω (oikeō), often with the connotation of “taking up residence,” “settling down,” being at home,” etc. Cf., e.g., Matt 2:23; Acts 17:26; 22:12; Eph 3:17; Col 1:19; 2:9. Hence, the addition of the adverb “truly” is implicit in the connotation of the verb in a context such as this.

In other versions

But according to his promise we are waiting for new heavens and a new earth in which righteousness dwells.

But in keeping with his promise we are looking forward to a new heaven and a new earth, where righteousness dwells.

But based on his promise, we wait for new heavens and a new earth, where righteousness dwells.

But we are looking forward to the new heavens and new earth he has promised, a world filled with God’s righteousness.

But according to his promise, we are waiting for new heavens and a new earth in which righteousness resides.

Nevertheless we, according to his promise, look for new heavens and a new earth, wherein dwelleth righteousness.

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