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If the next movie was based on the book series it would be called The Bourne Betrayal. This book was written by Eric Van Lustbader and not Robert Ludlum who wrote the books the previous three movies are based on.
However the last news from Universal Pictures (2008) was that the fourth film woud not be following the series and so the content and subject of the fourth movie will not be based on this book.
This fourth film was originally planned to be released in 2010 but shooting never began. There will be no film this year.
In November 2009 Matt Damon indicated that no script was yet approved but expressed hope that shooting would begin mid 2011.
However in February of 2010 at the premiere of Invictus he said the follow on to the third film was at least 5 years away - but that maybe a prequel would be filmed with a different actor sooner than that. (Video of Interview below)
All in all - not good news for another film in the near future...
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