Another interesting tidbit is that the movie will also address John Connor’s future. John was not shown in the first trailer, and so far there has not been an actor announced to play Sarah’s son in Dark Fate. He’d presumably be in his 40s by now … if he’s still alive. Rumors, via Bloody Disgusting, suggest we may be getting a flashback to a T2-era John Connor, using a young actor as a CGI stand-in. It doesn’t look like T2 actor Edward Furlong will be returning, in any case.
Article source: https://www.cinemablend.com/news/2472254/terminator-dark-fate-is-rated-r-and-continues-john-connors-story-james-cameron-confirms