From what I understand nothing was slated, so much as Hayden Christiansen said that he'd love to do it and that he's been getting into acting shape again if called.
Personally I'm all for it. Honestly, while Anakin has cringe worthy moments in the Prequels, the more I watch them the more I think that he was just doing exactly what he was told. This matches up with interviews which reveal that Anakin wanted to play a more brooding, darker character but Lucas told Hayden that the way he thought he was going to act was not the way he actually was going to be. I don't think he was bad at all. I think he perfectly conveys how frickin' weird Anakin is with his infatuation with Padme, and honestly is the exact kind of behavior I've seen in real people. There is a certain... authenticity to his acting that I like. Even if it is absolutely uncomfortable to watch.