If Anakin is one of many Darth Vader's, isn't this a plot point that should be explianed at some point? And isn't his accepting this identity, as well as the history of this identity, the sort of thing that the OT should have dealt with? Perhaps Palpy could have offered for Luke to become the new Vader?
This is a dramatic and total reinterpretation of the character. Darth Vader isn't one dude... he's like the Phantom. Anakin didn't become Vader, he took someone elses mantel. If the goal of the NPT is to write a series more in line with the OT, I think that would be a step in the wrong direction. In this case, I think the reaction to "I am your father" would not be shock, but confusion.
On the otherhand, the lie starting immediately has a lot of potential. Obi-Wan, who has to know Vader's actual identity, lying to the people around him immediatly (specifically NotPadme) to spare their feelings is an interesting note to his character, withoutreworking our understanding of him in the OT.
And that photo is badass. What is it from?
Also, if there are so many fallen Jedi around, how come they seem to have so little bearing on the OT? And if Obi's apprentices keep going bad, why doesn't he stop training people!?!?
My proposal is that when Anakin goes bad (still Anakin), he leads a contigent of red-sabered former-Jedi as the bodyguards of Emperor/President Palpatine. Yong bold Jedi have always looked up to him because he's badass, and his defection to Palpatine's party leads to a mass exodus from the Jedi Knights. It's not a club of evil like the Sith, but a political schism in the Jedi.
It is this group (The Legion of Lettow) that help wipe out the Jedi. But at some point Anakin/Vader or Palpatine realize that a group of superpowered asskickers with no moral code is not a good thing to have in a new government, and assassinates them all via a bomb in their shuttle. (Inspired by the Nazi's Night of Long Knives).
This schism lets us have large scale lightsaber battles, whille not having to create some kind of 'Evil' club or having apprentices go bad left and right.