In my opinion.. we already have this :)
Think of your soul as some sort of energy. Once our body decays and dies.. that energy is released and goes somewhere.. probably into another body if we want.. perhaps in to any creature we want, who knows.
We do know its energy.. and energy can't be destroyed only dissipated ;)
It's exactly the same thing.
I love the idea of living forever and being able to transport my consciousness into another body.. you could do some amazing things.
But the question is.. would that take us away from our true path.. and give us a cheap.. watered down imitation of the real thing?
Some food for thought :)