Flex builder will next be called Flash Builder 4? Yes. There is a sensible reason behind renaming or rebranding the product name. This maintains the uniformity in the products falling into the Flash Platform (Flash Builder, Flash Catalyst, Flash Player, Flash Player for the Digital Home). “Flex Developers” and “Flex Development” will still be called the same. Neither will Flex SDK change its name, nor will the framework. Read more on Serge’s blog.
