Note: Don Preston is a full preterist and therefore his teaching cannot receive full or blind acceptance. His many videos on YouTube are worthy of listening and interacting with in a timeline manner.
@1:55: This is a very unique perspective on this event. Mr Preston may say that "more than a few" have written this but I have neither read them or heard of them. I am not inherently against it. I think it could significantly alter the perspective of John's first vision where Jesus is presented quite gloriously.
@3:35: This is an interesting parallel. The shared emphasis of glory in Christ's return is interesting. We recall the importance of Elijah and Moses disappearing (though I'm not fully convinced on this). However, I am not sure I see how the vision in Revelation 1 shows the passing of the law.
@6:00: I am willing to permit Mr Preston's use of 2 Peter 1 right now. And I'm willing to permit that the whole of Revelation speaks to the conclusion of God's covenantal relationship with Israel. But I'm not sure I buy the link between Revelation 1 acting as a link with the transfiguration. He hasn't made a reasonable argument for it.
There are some very interesting thoughts here about John being on "The Lord's Day". This is something that I will need to return to in personal study. I have to stop short of fully endorsing what Mr Preston said because I don't concede his interpretation on the transfiguration and I don't see the full link between it and Revelation 1. But man that was a video loaded with some good food for thought.
*Note: Since watching this and typing my response, I have listened to Kenneth Gentry on the matter of the "Lord's Day." He shares Mr Preston's view and gave a decent argument for the perspective. It remains a minority view and one I'm still unsure about.*