Originally Posted by sakichop 
Anyone heard if they are going to continue to add to the EA until it's ready for release? For instance act 2 when it's ready. Like blackguards did?
Best guess probably a new act every 5-6 months at best. A few classes and origins wont be added to the Early Access version also. Writer confirmed that on Twitter and Twitch.
The game should have a total of three acts. Hence why Larian has stated a minimum of one year development on Early Access, but it can take more time if needed to finish.