I'm just guessing, but I'm thinking that Patch 7 will be the last update before the game leaves Early Access, and that if they do decide to release more levels, it will be through that update.
Guessing you didn't read the part about this being the biggest game they've made... Personally I'm guessing we have over 24 months before release.
Aaaand once it is there's going to be massive balance issues because the entire game has been made to level 4.
Honestly if i knew this was going to be the state of the game after 12 months, would not have bought it and have already steered people away from buying it, not because it's EA, but what they're implementing in place of finishing the game proper is insulting. They keep adding flavour without fixing anything and development of character is non existent. Everybody whining for more flavour before the game's done and it's just depressing. Implement sorceror draconic origins, make the games max level cap a nothing level 10. Because honestly, level 10 is a nothing level and playing a Baldurs Gate game to be stuck to that level.... might as well play the first one again.