Is Darth Vader Returning For Star Wars Rogue One & Episode 8?

The Star Wars rumours are starting to gain momentum as according to Making Star Wars, Darth Vader will be returning in some form to Star Wars: Rogue One and possibly Star Wars Episode 8.

Star Wars: Rogue One is set to take place between Episode 3: Revenge of the Sith and Episode 4: A New Hope, which could easily include scenes involving Darth Vader, with rumours of a fully operational Darth Vader chest piece along with  the helmet made it to the creature shop for the next film. The lights on the chest piece work and everything.

Also there are rumours of Hayden Christensen returning to film for Star Wars: Episode 8 in some fashion:

A team in the U.K. are soon heading to the U.S. to begin training Hayden Christensen for a Star Wars: Episode VIII appearance of some sort.

There could be any number of reasons for Hayden to be involved in the project, such as playing a Ghost, a flashback or possibly even a clone.

Again, these are just reported rumours and might not come to light, but what do you think about Darth Vader returning to the big screen?