Found this at the english "Gundam The Origin" site

GUNDAM RISING - GUNDAM THE ORIGING Target U.C.0079

During the One Year War in September, U.C. 0079, the Earth Federation Forces, that were on the back foot, were secretly operating the arsenal in Side 7, Noa which had been under construction. This special video depicts the epic GUNDAM RX-78-02 rising for the first time.

It is a short directional movie created by the staff of “MOBILE SUIT GUNDAM THE ORIGIN.” It also anticipates the story coming after “Chronicle of Char and Sayla.” From here, the project of “THE ORIGIN” will accelerate towards the era of the One Year War.

Here's the link:http://www.gundam-the-origin.net/en/special/video.html