Java 7 will have closures!

These pages have the details:

• “Closures after all?” is continually updated with new links and information.
• Gafter’s “Closures for Java” has been updated with the new syntax which closely resembles FCM. Thus, the new closures use FCM syntax and (a simplified version of) Gafter’s type system. Correction: Gafter’s spec was written 2 weeks before Devoxx, as an attempt at a compromise between the competing proposals.
  
• Reinier Zwitserloot has more background on how everything came about.
• Update 2009-11-22: Stephen Colebourne gives an overview of the current situation.
• Update 2009-12-03: Mark Reinhold posts “Closures for Java: The Q&A”.