The NBA 2K18 Demo is set to be released on September 8th, 2017. The NBA 2K18 Demo is called a prelude, essentially being very identical to 2K17's prelude demo. What we know so far is that the demo will allow you to create and start your journey with your mycareer through the typical trials and tribulations that 2K usually includes within mycareer mode. There is some speculation that 2K will feature an online demo this time around, though it has not been officially confirmed through the games developers or marketers. Once the NBA 2K18 Demo is released, we will have a clear cut idea of what game will reign supreme as the leader of the basketball for the upcoming year.