Sony has always intended to first prove the technology in front projectors and then come out with rear projectors. I would say that they are still in the early part of phase 1 - proving it in front projectors.
The rate of progress on the front-projector side has been slow and there is no demo of a rear-projection set, let alone a reasonably priced front projector.
I'd guess a rear projection model is due no sooner than the middle of next year, but until there is a prototype, you can readily assume it won't be out soon. I don't believe Sony has shipped a new important TV without showing it first at a major trade show in several years.
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