http://www.starwars.com/news/a-statement-regarding-new-rumors
"We don’t normally respond to fan or press speculation, but there is a rumor circulating that we would like to address. We want to assure our fans that Lucasfilm has no plans to digitally recreate Carrie Fisher’s performance as Princess or General Leia Organa.
Carrie Fisher was, is, and always will be a part of the Lucasfilm family. She was our princess, our general, and more importantly, our friend. We are still hurting from her loss. We cherish her memory and legacy as Princess Leia, and will always strive to honor everything she gave to Star Wars."
The fact that Disney had to issue such a press release at all is testimony to the public unease on this issue in the wake of Rogue One. If LFL’s digital wizardry has no qualms about zombifying an actor who’s been dead for 20 years, why should they show any (the thinking goes) about resurrecting a mainstay of the SW franchise who died unexpectedly young?
Obviously Disney and LFL weren’t planning to have to confront this issue head-on immediately on the heels of Rogue One’s release. However, digitally resurrecting Peter Cushing was a Pandora’s box and – especially given Lucasfilm’s track record of embracing all forms of CGI – it’s understandable that people don’t expect it to stay closed.