Εὐλογητὸς ὁ θεὸς καὶ πατὴρ τοῦ κυρίου ἡμῶν Ἰησοῦ Χριστοῦ, ὁ κατὰ τὸ πολὺ αὐτοῦ ἔλεος ἀναγεννήσας ἡμᾶς εἰς ἐλπίδα ζῶσαν δι᾽ ἀναστάσεως Ἰησοῦ Χριστοῦ ἐκ νεκρῶν, 4 εἰς κληρονομίαν ἄφθαρτον καὶ ἀμίαντον καὶ ἀμάραντον, τετηρημένην ἐν οὐρανοῖς εἰς ὑμᾶς 5 τοὺς ἐν δυνάμει θεοῦ φρουρουμένους διὰ πίστεως εἰς σωτηρίαν ἑτοίμην ἀποκαλυφθῆναι ἐν καιρῷ ἐσχάτῳ.He asked if I had any thoughts, and I haven't. I did a fairly quick scan of grammars and commentaries, and found no light there, either.
Now, perhaps it is as simple as disputing the period at the end of verse 5, as verse 6 (beginning with ἐν ᾧ) certainly carries the thought on. It is certainly possible that the sentence stretches to verse 9. In that case, the first finite verb would be ἀγαλλιᾶσθε, in verse 6. If that's the case, however, does that reflect back on the exegesis of vv. 3-5?
The microphone is open to your thoughts as well.
Good catch, Bryan!