I have recently visited the Jeddah King AbdulAziz Int'l Airport New Terminal 1, which has partially opened for flights.

The video shows you both the exterior and interior, in both landside and airside of the new terminal. There is a large green garden in between the terminals to provide nice greenery and peace for travelers. I also visited Saudia new Al Fursan Lounge on the domestic side. On arrival, there is a large unique aquarium which house over 2,000 fishes. The new terminal connects directly to the train station which will run direct service to Makkah and Medina.

The official is stating that by Q1 next year, all existing flights from South Terminal will moved to the new Terminal 1. No date given from other airlines in North Terminal.