This probably shouldn't be all the surprising, but it's being rumored that Darth Vader will be featured in Star Wars: Rogue One and that James Earl Jones will return to voice the character.
The info comes from Making Star Wars that states Darth Vader's iconic costume from Episode IV: A New Hope is being recreated for Star Wars: Rogue One. It's further suggested that a new actor looks to be cast in the suit as the physical Darth Vader.
It's said Darth Vader looks to be used in the movie "as a prominent player in a few scenes and something to fear for the heroes," and it's noted this would fit with Episode IV that sees Darth Vader chasing the stolen plans at the start of A New Hope.
James Earl Jones did return to voice Darth Vader in Star Wars Rebels, so obviously a part in Rogue One wouldn't be out of the question.
"Star Wars: Rogue One" has a December 16, 2016 release directed by Gareth Edwards starring Felicity Jones, Diego Luna, Ben Mendelsohn, Donnie Yen, Jiang Wen, Forest Whitaker, Mads Mikkelsen, Alan Tudyk, who plays a performance-capture character in Rogue One, and Riz Ahmed.
Rogue One tells the story of resistance fighters who have united to steal plans to the dreaded Death Star.