Thanks to you, Episode 2: Two Households will have better pathfinding, the option to switch between "extended" and "short" narration, new walking animation (with a walk/run toggle), more subtitle options, and widescreen support. In terms of gameplay, there are 17 new locations, a roughly 4-hour-long quest, and "puzzles a-plenty to keep you entertained."
If you want to catch up on this King's Quest business so you can understand why fans would go to the trouble of making a tribute game, GoG.com just added a King's Quest 1-3 bundle to its shop, for $9.99. You can get a pack with 4, 5, and 6 for the same price. We'll warn you now: these games look and sound quite vintage.