I was really hoping they'd go for an Infinities series for the Prequel movies:
TPM - What if Darth Maul knocked Qui-Gon off the platform earlier in the Duel of the Fates instead of Obi-Wan and it was Qui-Gon who got isolated from Obi-Wan and Darth Maul by the energy fields, resulting in Obi-Wan getting ganked? A Qui-Gon-trained Anakin storyline would have been awesome. Does he fall faster, slower, not at all? Maybe Dooku doesn't fall himself or does and manages to turn Qui-Gon, or vice versa.
AOTC - What if Zam Wessel inadvertently succeeds in assassinating Padme on the landing platform after the bomb is placed on the opposite side of the Naboo cruiser, taking out the fighter she was hiding in? Anakin's fall to the Dark Side is disrupted. Maybe this time he doesn't fall or perhaps he grows too attached to Obi-Wan and Palps has to work with that. Investigation into the assassination takes a different path, no Battle of the Arena or larger Battle of Geonosis. What was Palps orginal plan to introduce the clone army? It certainly wasn't banking on Jango getting tracked back to Kamino.
ROTS - What if Grievous is alerted to what is transpiring in the observation tower of the Invisible Hand and rescues Dooku before Anakin can execute him? Dooku is still handless and betrayed by Palpatine, but he's in command of the Seperatists. Can he trigger an actual all-out civil war now that Palps can't play both sides to his own advantage? Does Dooku reveal Darth Sidious' true identity to the galaxy? Would that revelation splinter the mouldering Republic/fledgling Empire and allow for a Seperatist victory?