Service Pack 2 for Dynamics GP 9 is out. It was released on Friday, Dec 1st. As always you'll need CustomerSource access. You can get the service pack here.
The Installation Guide is available here. You'll need to do a server install first, as usual, and the documentation indicates that a reboot will be required, so plan accordingly and read the whole installation guide.
This Service Pack is for English users only. A multilanguage version will be coming at a later date.
You should be able to use GP's Client Update feature to push this update to all your users. If you don't know how to use client update, we've got instructions here and a 5 minute video here.
Happy Updating!