Warner Bros. is currently showcasing its DC Cinematic Universe in Hall H at the San Diego Comic-Con, and the first nugget of information has been revealed with the announcement that the next Green Lantern movie is to be called Green Lantern Corps.
This appears to confirm the previous report that the film would see multiple Green Lanterns., with the report suggesting Hal Jordan, John Stewart and Guy Gardner would all feature. An image was shown that featured multiple human Lanterns, but not further details were revealed about the potential cast or crew.
Green Lantern Corps is set for release on June 19th 2020.
https://youtu.be/IWWtOQOZSTI?list=PL18yMRIfoszEaHYNDTy5C-cH9Oa2gN5ng
