Here are some of the highlights from tonight's excellent Hyperspace Chat with Pablo Hidalgo, the author of the daily Hyperspace Set Diaries (highlight to read):
Rohan Nichol has nothing to do with Han Solo, nor will we be seeing a young Han in Episode 3.
Two more cast members are likely to be announced very soon, one of which is young and new to Star Wars.
Not all of Darth Vader's scenes have been shot.
We won't see Geonosis or Dantooine in Episode III.
Hayden's last day on set is September 17th.
Scenes involving the twins have been shot.
In AOTC, we did see the person who ordered the clones.
You'll have to hit the link above to read more juicy morsels from this chat. When you've done that, discuss with other fans in the 3SA forums, where spoilers are allowed.