The Vader resurrection rumor is from a British tabloid. That alone should tell you how credible it is.
And yes, SW has shown that you can clone people's bodies, but there's no indication the personality comes with it. The Clone Troopers in The Clone Wars
all have very distinct personalities, rather than being a bunch of Jango Fetts. A clone of Anakin Skywalker would not be Darth Vader, or even Anakin. It would just look and sound like Anakin.
Although there was that Dark Horse comic where Palpatine somehow managed to transfer his mind into a clone body, wasn't there?