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The film transfer of T2 seen on the Skynet Edition was originally done in 2003 for the T2 Extreme DVD, and was telecined under the supervision of both Lightstorm and THX. Both approved the transfer. In 2006, we took that same transfer, ran it by Lightstorm again for approval, then encoded it in MPEG2 for the first BD release...
... For the current release, we took the SAME approved HD master that we used in 2006, and put it through the manual dirt-cleaning process I detailed above. As far as I know, that was it. We then encoded it in VC-1 and sent it over to Lightstorm for review at Cameron's request.
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While I would have loved to do so, we could not do a brand-new transfer of the film, for several reasons:
1) Cameron has to be involved in and approve all new transfers, and he is a bit busy with Avatar and simply could not devote the time... in fact, a new HD transfer of "The Abyss" has been awaiting his review/approval for three YEARS now; and
2) Studio Canal and Lionsgate wanted to do this release to coincide with the theatrical release of "Terminator: Salvation", which dictated our schedule and the resources given to do such a "maintenance" release.