First off I don't think Anakin will try to kill himself, Obi-Wan knocks him in the pit and leaves him for dead. Anakin pulls himself out(not sure how but its going to happen) and joins Palp who builds the Vader suit. I did like the idea though, especially Yoda, Obi, Palp, and Ank/Vad all on one planet and it explodes, maybe that planet would be Naboo, while the queen is on Alderran having the babies. This would explain why we never here of Naboo in the OT and Jar Jar as well. It would be cool to then see Yoda leave for Dagobah, Obi to Alderran to get Luke and take him to his brother on Tatooine. I think EP3 will end with perhaps Yoda and Obi talking about Luke and Leia and one or both describe a foreshadowing of the future, and thus that is why neither can interfere, they know Luke's destiny to win.....probably not, just a thought.