It takes place in the new Eberron campaign setting, not Forgotten Realms (the location of Baldurs Gate).
It takes place entirely within the city of Stormhold.
The level cap is 10(for now).
You can only gain experience by completing quest, not by killing monsters.
It is nearly impossible to solo with any class, it is highly reccomended you do quest with well balanced groups.
The combat is a mix between classic DnD dice rolls, and twitch combat where dodging and blocking and rolling out of harms way done manually.