Okay, so I've had this idea in my head a while, but never got around to mentioning it.
Spoiler alert for anyone who hasn't seen Donnie Darko...
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So, in the Donnie Darko film ending, Donnie, the main character, went through time one month to the beginning of the storyline, then died, which obviously changed everything. The twist I liked, however, was that a lot of the side characters retained their memories of what happened in the alternate timeline.
I think there is potential to copy this for RotR, in which Anakin wakes up again, following the shot of Anakin's ghost appearing beside ghost Obi Wan and ghost Yoda. The past few decades or so had not yet come to pass! But everyone now knows what will happen! To make it easier to include more characters, perhaps it could be Anakin waking up in Episode II, so that Dooku could be among the characters remembering what went down.
The Jedi, Palpatine and Dooku, Padme, Jar Jar, Ric Olie's ghost, and anyone else of importance could have silent moments of awkward revelation in a montage not unlike the one seen in Donnie Darko, as seen here:
http://youtu.be/2PUFJmsCZLE
Then it could cut to an awkward scene where the Jedi and Palpatine are at a meeting (as seen in Episode II), and both sides know everything about the secret of the Sith and the upcoming war.
It's a long winded idea, and could be arranged in any number of ways, but if done right, could be a fun way to come full circle back into the prequel era of the Ridiculousness saga.