Baldur's Gate Enhanced Edition getting an expansion pack

Although I considered Baldur's Gate to be new fangled since it wasn't like the Gold Box games or Eye of the Beholder, it was still an AD&D based game and has been extremely popular since it was released, to the point where it received an "enhanced edition" a couple years ago, and now that enhanced edition is getting an expansion pack, Siege of Dragonspear

• Expand Your Story: Explore new areas, fight new monsters, and win new rewards in the Siege of Dragonspear expansion to Baldur’s Gate: Enhanced Edition. Continue the adventure by exporting your game to Baldur’s Gate II: Enhanced Edition
• The Crusade Rises: A sharp and subtle adventure that pits you against an enigmatic new foe
• Explore the Sword Coast: Venture through vibrant new hand-painted areas in the classic style of the original Baldur’s Gate
• Gather Your Party: The original cast returns to kick butt for goodness - along with Neera, Rasaad, Dorn, and four new additions!
• To Infinity and Beyond: Updated UI and improved Infinity Engine features
• Extra Class: New items, quests, and a new class: the spirit-calling shaman!
• Venture Forth With A Friend: Functional, extensively tested cross-platform multiplayer on all supported platforms
• Story Mode: A difficulty setting to allow players to experience all of the story with none of the Game Over screens

Edit:

Here's a trailer on youtube