I hear they are going to re-insert David Prowse's dialogue in the next edition. Thus, it will turn out that, in fact, Obi Wan did kill Luke's father, in episode III. Anakin has been dead all this time and just lurking around in the force for kicks, having a good laugh. Meanwhile, Luke and Vader met in an internet chat room and Vader disguised his identity, a chronic stalker, by claiming to be Luke's father.

So, there you go. Vader was never Anakin to begin with, the joke's on all of us, and Hayden belongs in the film. Who knew?