Play it.
But in all seriousness, I'm exited to try the different augmentations, prosthetics and customization options, likely with new playthroughs with each character build. I'm also intrigued to see how well CDPR will do at making an FPS, or to be exact, shooting mechanics.
Second to that would be the setting. I can't wait to explore the city and factions. There's just not enough cyberpunk-themed games, or media, out there. And after watching Altered Carbon 1+2 I'm more than ready for more.