There have been rumours for a while now that the working title for Star Wars Episode VIII will be "Space Bear", and Carrie Fisher confirmed that today by Tweeting out the following photo of the logo (and her famous pug, Gary Fisher). It's hard to say when we'll learn the movie's official title.
Star Wars Celebration this July is certainly one possibility, though Lucasfilm might save the reveal for when the first teaser trailer is released. That could be with Rogue One: A Star Wars Story this December, but if the studio wants to keep the focus on that, we may be waiting until 2017!