Re:Jumping the Gun (Score 1)

As I understand it, this is the final step to deploying Javascript 2.0 which was sceduled to be included in Firefox 3 anyway, but since Macromedia/Adobe have been using it for awhile, this helps get the ball rolling faster and allows (as mentioned) better integration. This will also mean that XUL will have the same script engine as Flex. It's not just Web 2.0 however. Anything done in Javascript can use the new OOP language features. Microsoft has been using a form of ECMA 4 as well, but it's anybody's guess as to when IE will get it.