Anyway, I'm sure you all saw teaser trailer from almost 3 years ago. I was a little shocked when I realized it'd been that long, but they did kinda make Witcher 3 in the middle there. Also, supposedly, Cyberpunk 2077 will be bigger than Witcher 3, which is... ambitious.
Regardless, I'm bringing this up again because I wandered over to their (semi) active forums, and found this handy FAQ. Some highlights:
You’ll be able to create a character from the ground up and then experience Night City as a totally open world setting. 
It will be a rise-to-power story about "someone who rises from a filthy gutter to stand against a hostile world." 
Game will be a story-driven experience set in an open world environment, which will be driven throughout by player choice.
It will be non-linear.
Story will mainly focus on contemporary issues, and the world we will present is a kind of filter for those things.
Advanced RPG mechanics based on PnP RPG system upgraded to the 2077 setting. 
Huge arsenal of weapons, upgrades, implants and cool high-tech gadgets. 
Takes place in a Sandbox environment in Night City. 
A whole system of cyber-implants will be implemented, allowing you to modify your limbs. 
Similar arm implants (that was scene in the Teaser Trailer) will be present in the game. 
Cyber-psychos will also be present.
Aerial vehicles, the psychosquad, and the weapons seen in the Teaser Trailer are as well present in the game.
They are experimenting with dynamic conversation.
I gotta say, this certainly sounds amazing, and I can't wait for... well... something. Like another video. I mean, that thread's pretty old, and this is some pretty major promises, but I'd like to think CDPR can pull it off, as opposed to it being another Duke Nukem Forever.CDPR are trying to let the player print your character sheet from the PnP game.
They are trying to make the game to be as close to the original PnP RPG as possible. There will be changes in the balance of classes and how particular skills work.