Rewatching that minute demo CD Project Red released at E3 2018 actually has a few points that foreshadow Keanu's arrival, even though the seemingly a semi-related tangent about the music of Samurai was done before he came onboard.
Reeves' character Johnny Silverhand is the frontman of the in-game band and while CDPR didn't break the promise of Cyberpunk 2077's soundtrack featuring music that's before, the actor was not part of it.
According to Reeves, CDPR already have a band for Cyberpunk 2077's Samurai work, but he remains hopeful he might get to chip in.
"You know, we have a bit of time, so maybe we'll see what happens", Reeves said through laughter, adding, “Maybe the lead singer of the band will let me have some kind of influence in there. We’ll see.”
Silverhand's adventures date back as far as Cyberpunk 2013, and Samurai are prominently featured in the world of Cyberpunk 2077 as well, so it's no wonder CDPR are going for professionals. Nevertheless, a man can hope, no?
As the in-game lore goes, Silverhand died but with his body never recovered, he remains as a virtual ghost, hence the flickers from the trailer.
The fact that he's dead isn't stopping him from being the character in Cyberpunk 2077, the most important being you, the protagonist of course.
Silverhand will not always be your ally, mind you, as he very much has his own thing going on. This will leave you with plenty of choices of where to take your Cyberpunk 2077 character.

Reeves also discussed Cyberpunk 2077's branching storylines and , insisting he's always drawn to good stories. As we've come to expect from the man, he mentioned but downplayed his contributions to Johnny's character. C'mon CDPR, just let the guy sing?
Cyberpunk 2077 by CD Project Red, RPG in Cyberpunk 2020 universe































