TVGuide is basing that on speculation, probably.
I agree with you bigsef2, and with Ush. Ush is right when he says that they are prequels, to be watched after the OT. But McCallum has said that it is one 12 hour movie to be watched from start to finish.
I don't think Lucas should tamper with the OT, no matter how you watch the six films.
The fact that Palpatine isn't in the OT as much makes him more sinister. We see him a lot in the PT, because he has to do everything himself, because he's not as powerful. IN ANH, he has everyone working for him, so his mention is like "Who is this guy who has control over everyone?"
In ESB, we watch Vader, the ultimate badass BOWING to Palpatines hologram. Now we know Palpy is in control. Then he shows up in Jedi.
It's like Palpatine started from nothing in TPM, then became the ultimate bad guy, who didn't even need to show up but he could still run the universe.