there was a hack with older MBPs where people were implanting a higher rez panel into them. the ifixit teardown of the MBPR shows the panel is fused to upper lid, meaning if the panel has to be replaced the whole lid would have to be replaced. So there is little chance that there will be replacement-part panels available anywhere. And it seems ever so unlikely that the entire MBPR lid would be able to bolt on to a MBP. Do you think the regular MBP will ever be offered with the retina display?