How is that anything like Valve announcing L4D2? You could compare that too Mojang announcing Minecraft 2.
They are doing this the same way that many companies hav, like Blizzard for example. They have public testing servers when they need to test content. Players make the choice if they'd rather keep playing the released version or go test the next version. It's a great way to do it when you don't have any internal testers besides the developers themselves.
That reference was pretty weak.
No I was just under the impression that now its a "fully released game"
That all updates would be mandatory