I agree in the office is when most will be told. I can see a full confesion to a soon to die Windu, leaving nobody to be the wiser, but the audience of course, perfect time for Lucas to reveal all that he wants, he may show restraint or he could reveal a world of information at this point. and of course this is the point where the Darth Moniker is given,,,,,, but thats a whole different thread 🙂
not to get off the SW subject, but hitler's mom left when he was young and he thought she didnt love him, and he had other people telling him stories like that(that all jews are bad and evil) which eventually led up to his jew slaughtering. So the same in Anakin's case, its sad the influence that other people have on you, can lead to measures like that.