The action takes place in Night City, a new conurbation on the California coast between San Francisco and Los Angeles. Click to embiggen. This map was taken from here.
Unlike CD Projekt Red's previous game, The Witcher 3, Cyberpunk 2077 will be played primarily from a first-person perspective. You will see your character in certain circumstances (most notably cut-scenes and dialogue), but the game will be predominantly played from first-person, so more like Fallout or Deus Ex.
Although the game will be set in 2077, it's an alternative timeline that diverged from our own in the 1980s. The Cyberpunk pen-and-paper game history and timeline, which began in 2013 and became most popular through the Cyberpunk 2020 game, will remain intact. Characters from established Cyberpunk lore will appear in Cyberpunk 2077, as will corporations and factions.
Night City has six distinct regions: Watson, Westbrook, Santo Domingo, Heywood, City Centre and Pacifica. Pacifica is a dangerous, lawless slum area (see the map above). Other areas are incredibly rich. The city is very vertical in orientation. The game has a full day/night cycle and numerous weather conditions.
You can get around the city on foot, by subway, by car and by motorbike along with other vehicles that haven't been shown yet (but may include taxis, hovercars and ambulances).
There will be ranged combat, focusing on the use of guns, as well as melee. You can also hack other character's cybernetic enhancements, and use stealth to take people down. The game will include weapons that can fire through walls or fire "smart" ammo that can track targets. Combat in the game has been designed so people who enjoy "twitch" combat can dive in with ranged combat and those who are more interested in roleplaying can use smart weapons or even stealth to avoid head-on combat altogether.
There will be three very rough "classes" you can follow: netrunner, techie and solo. However, these classes are highly fluid, allowing you to mix and match skills, attributes and cyber-enhancements as you like. Other Cyberpunk classes and archetypes, like rockerboys and corporate, will appear as other characters.
Advancement will come in two formats: standard EXP is gained from completing the main story quests. Streetcred is gained from doing side missions, killing tough bad guys and even things like wearing a fashionable jacket. Improving your streetcred will unlock new vendors, fixers and contacts who can give you access to new jobs.
As you gain levels, you can improve your skills and cyberware, as well as gaining perks, special abilities you can use in and out of combat.
As with most cyberpunk narratives, the main story will focus on the inequality between the poor people in the streets and the rich people in the towers above.
Cyberpunk 2077 will be released on PS4, XB1 and PC. No release date has yet been announced.