Update: Momot also clarified that there will be different 'showings' for the game on the show floor and behind closed doors.
Won't go into details now but these showings will be different.May 23, 2019
Original story: As expected, Cyberpunk 2077 won't be hands-on at E3 2019, but the good news is that anyone on the show floor can go along to the booth and see a demo presentation. CD Projekt Red's Global Community Lead Marcin Momot clarified this on Twitter today, after being asked about it a whole bunch:
To answer many questions about the demo and whether or not @CyberpunkGame will be playable at E3 -- we are going to be hosting gameplay presentations (game played by us) in that cinema.May 23, 2019
Last year, Cyberpunk 2077 hands-off demos were reserved for media appointments, and footage of the game in action wasn't shown publicly until after Gamescom in August. If you're in LA this June and are prepared for a little queuing, you can check out Cyberpunk, too. The game will be demoed at the South Hall in the LA Convention Center, booth 1023, on June 11-13th. Just be prepared to push past a lot of lads carrying promotional tote bags.
CD Projekt's president and CEO Adam Kicińsk previously described E3 2019 as "the most important one ever", promising that the developers have "really prepared a strong show". Hopefully we'll find out the game's release date, too—or at least its release window.