CD Projekt Red are still being tight-lipped on any information regarding Cyberpunk 2077, but a few bits of information come along every now and then, usually as a result of fervent fans' continuous questions. One such case happened in Cyberpunk 2077's Twitter, when a fan inquired whether the game's beta will be open or closed.
It turns out that it was wrong to assume Cyberpunk 2077 would go into a beta test at all, as the
official response was that CD Projekt Red has no plans for either closed or open beta. This means players will get their first chance to play it during a potential demo at an expo or if that doesn't happen either, on Cyberpunk 2077's release day.
Considering the state of games that enter "beta" tests lately, being deprived of Cyberpunk 2077 until it's ready may be a blessing in disguise for the fans. Some of the most recent examples that serve well to show that beta tests these days are just publicity stunts without offering a properly finished game. Fallout 76 and Anthem come to mind right away.
On top of that, many players make up their mind about a game based on beta tests, since usually not much changes between beta and full release nowadays. Some exceptions still happen, but we mostly get a few glitch fixes between beta a full release, with many bugs still remaining in the game, ruining the initial impressions and potentially the whole experience.