CD Projekt Red has released a Japanese version of the Cyberpunk 2077 E3 trailer. It's the same video we've already seen, but the whole thing's obviously dubbed, and that includes Keanu Reeves' lines as Johnny Silverhand.
We've seen this trailer dozens of times in English, so watching it through in Japanese is pretty interesting. The voices seem to fit, even if the mouth movement doesn't quite match up at points. And yes, as far as we're aware, the the game will offer a full Japanese dub, much like The Witcher 3: Wild Hunt.