A new story expansion is in development for Baldur’s Gate: Enhanced Edition.

Baldur’s Gate: Siege of Dragonspear will add a new chapter to the Bhaalspawn saga and bridge the gap between Baldur's Gate: Enhanced Edition and Baldur's Gate II: Enhanced Edition.

Characters from Baldur's Gate: Enhanced Edition can be imported and used in Siege of Dragonspear, and characters from Dragonspear can also be exported for use in Baldur's Gate II: Enhanced Edition.

The plot, as per Beamdog:

Though Sarevok is dead and his plan for war averted, peace eludes the citizens of Baldur's Gate. A crusade marches from the north, seizing supplies, forcing locals into military service, and disrupting trade along the Sword Coast. A charismatic warrior known as the Shining Lady leads this army, her background shrouded in mystery. Can the rumors be true—is she, like you, the child of a god?

The closer you get to the Shining Lady, the more you realize your father, the dead Lord of Murder still casts a long shadow upon your path. Baldur's Gate has put its faith in you, but you must determine whose interests you truly serve before you face the Shining Lady among the ruins of Dragonspear Castle...

According to the developer, Siege of Dragonspear will offer more than 25 hours of gameplay, and will support cooperative cross-platform multiplayer for up to six.

It will run on the Infinity Engine so as to create a cohesive, old-school gaming experience that meshes with the existing Baldur’s Gate games, and will feature an updated UI, new items and quests, a new shaman class, and vibrant new hand-painted areas in the classic style of the original Baldur’s Gate.

Siege of Dragonspear will release first on PC, Mac, and Linux, with iOS and Android versions following shortly thereafter, prices and release dates TBA.

There’s more info on the expansion’s characters and locales on the game's official site.