Multiple sites (like /Film and Metro UK and NBC News) are claiming Hong Kong action star Donnie Yen has been cast in Star Wars: Episode VIII and/or Star Wars: Rogue One, possibly as a Jedi. This is just a rumor for now, nothing has been officially confirmed by Disney. IGN seems to be the most reputable site claiming that Yen may be in Rogue One in addition or instead of Episode VIII.
Yen isn’t a known name in the U.S., but has been in several action films. The first report of this casting was from a Hong Kong tabloid, the Daily Apple, which hasn’t been exactly reliable on movie news coverage.
Take this rumor with a grain of salt.