Game Updates, also referred to as Maintenance Windows, are posted by the Developers on the official zOMG! Forum. It is also possible to follow the Developer Team on Twitter; zOMGDev.
Originally, shortly after the Maintenance Window was complete, Qixter would delete the update post from the forum. The information would then be moved to his "Recent Updates post" and placed in the "News Bulletin" of the zOMG! start window.
Threads about game updates no longer gets deleted, but are archived in the zOMG! Forum Archives.