Terminator 4: Start of a new Trilogy?

Also in today's Variety is the news that Terminator 4, or Terminator Salvation: The Future Begins to give it its correct title, now has an official release date of May 22, 2009. Buried near the bottom of the report though is the first inkling that this new film will not terminate the series:

Storyline is being kept under tight wraps, but plot is part of a planned three-picture arc that begins after Skynet has destroyed much of humanity in a nuclear holocaust.

Not perhaps the hugest surprise, given Hollywood's desire to milk every franchise until its pips squeak, but with the inclusion of Christian Bale giving the new movie significant star weight this enterprise has the air of a fresh new start for the series after the comparative disappointment of Terminator 3 rather than  the beginning of a long slow slide into direct-to-DVD purgatory.