Something had to be done about confusing Flash Platform product names and if you paid close attention you could see this one coming for a while now. From the upcoming release onwards Flex Builder will be known as Flash Builder. I initially had some reservations about this but it does go a long way in making the name more accurately describe what the tool does. Flex Builder is more than a development environment for Flex framework based applications. Myself and I'm sure many others in fact use it primarily for creating pure ActionScript 3.0 projects.
The Flex name will still be used but now exclusively to refer to the framework. If you call yourself a Flex developer and code using the Flex framework that is still a perfectly valid job title. This seemed to be a particular sore spot for some people, but I don't get their argument -- after all, you don't call yourself a Dreamweaver or Visual Studio developer when talking about HTML or C#. Surely your job title describes the technologies rather than the specific tools you use.
One point I do feel strongly about: Flash Builder vs Flash Professional naming. The epithet "Professional" doesn't cover what the Flash authoring environment really is. With the new name changes it comes across as though Flash Builder is a basic tool and Flash Professional an extended version of that.
I'd recommend going one step further and rebranding Flash Professional to something like Flash Designer and get it back on track to being primarily a tool for animation and interface design.