So it is safe to say Artoo-Detoo is in Star Wars Rebels now? They went as far as to even tag it “hint.” So I’m saying “yes.”
— Star Wars (@starwars) October 11, 2013
What do you think? We never really doubted it and I expected they would find their way into the series. I do not believe Artoo and Threepio stay put for twenty years after Revenge of the Sith and then get back on the move for A New Hope. They’re too central to the Star Wars story to be put away on the Tantive IV or whatever happened to them.
Wookiepedia has a pretty big listing for Raymus Antilles from Revenge of the Sith.
Over the next nineteen years, Raymus Antilles continued to command the Tantive IV, but was separated from C-3PO and R2-D2 until almost immediately before 0 BBY.
Perhaps that has changed now and they get separated much early than listed above?
Maybe he ends up in the series? Maybe he’s related to the teens in the story? Or maybe he loses the droids in the action and they go off on their own adventures?