Well about our body, which is really a primitive vesel for the "real" us...I do agree that it will and must change, let say to a kind of lighted body in the first step. Due to the increased energies we hold/will hold, it will become inevitably that our body will have to change as it is in the present form, NOT capable of holding higher energies at all.
I remember a very interesting read few years ago, about why Jesus "had to die", ot at least his body. Just for the reason that his connectivity with the higher self was on the highest (at least known) possible level and the energies he had to deal with were so tremendous, that he knew he "have to die".
Otherwise (and this is just an assumption, but one that really makes sense), the energies "caught" in his body would've look for a way to "escape", which would cause them to eventually cause a massive explosion of an epic carracter, an enormous energy explosion so powerful to even distroy the world as we know.
Our body is not capable of holding energies with very high vibrations. So it is an irreversible process of evolving our bodies until to a stage where "we" (the real we) will have to give up being "caught" in any other form than a pure conscious energy.
A kind of body transformation is also described in the "Ramtha - The White Book", where Ramtha perfectly describes the process of him not being able to hold the human body any more in the present form, until he finaly "dissapeared" (phisically) from this world, transforming into that state of being we might call enlightenment at the moment.
Another one is the well known Dr. Jill Bolte Taylor's experience
But I assume you've already seen this video by now.