The 2008 remake about an alien and his indestructible robot will star Keanu Reeves as Klaatu, Jennifer Connelly as Helen Benson, Jaden Smith as Jacob, and Kathy Bates. Gort has not been cast at this time and will most likely be created using SFX.
The remake of The Day the Earth Stood Still will supposedly remain true to the original movie. However, there is a chance the remake will more likely remain true to the short story upon which the 1951 movie is based. In either case, the alien weaponry seems to have been upgraded. In addition to a city going dark, and a very brief look at the new Gort, the film trailer shows a cloud of black smoke, capable of rapid movement and disintegrating matter on contact.
In the 1951 movie, Gort is described as one of a race of robots created by the planets to maintain peace throughout the galaxy. If the 2008 remake follows "Farewell to the Master," the short story by Harry Bates upon which the 1951 movie is based will be used for the ending, which will not be revealed here.