ROTJ definitely needs a complete restructuring. There is a good movie in that mediocre jumble somewhere, but it can't be brought out by new effects and continuity polishes - it *needs* major story changes, in some ways more so than the prequels.
While I'm pretty sure Ady said there will be *no* purist version for Empire, I think it's a real possibility for Jedi.
And yeah, ESB:R will definitely not be done by Christmas. I'd say spring/summer 2010. May 21, 2010 would be really cool - 30 years to the day after its theatrical release.