These leaked shots look absolutely gorgeous, so much depth that had been lost in the various editions.
Whilst I typically prefer many of the changes Lucas made to the Original Trilogy, I look forward to seeing what comes of this. In any case, this new restoration will give fan editors so much better material to work with, and we should be excited for the wellspring of creativity that comes with it.
I think in an ideal world these would be released as are and also used for the base for the 2011 blu-ray special editions as well.