On the Steam store, the top message about Early Access has a Read More
button. The first sections reads :
Approximately how long will this game be in Early Access?
“Though Act 1 (the content for Early Access) is defined, Act’s 2 and 3 are work in progress. It’s therefore difficult to predict when 1.0 will launch. We anticipate Baldur’s Gate 3 being in Early Access for at least one year but we’ll have to see how it goes. It’ll be ready when it’s ready.”
How is the full version planned to differ from the Early Access version?
“Leading up to release you can expect a plethora of incremental improvements and new features to be added to the game, as well as the inclusion of new classes and races. The 1.0 release will include the full game including Acts 2 and 3.”
As Steam does not really have a real Refund policy (yes, I know, they technically have one, but it is a total insult to any honesty), I take the time to study games attentively before buying (mostly watching Youtubers I trust). Sincerely sorry if that sounds arrogant on a forum, but we all learn this the hard way (in my case it was ARK Survival Early Access).