The game will be powered by the Unity 3D Engine, providing you with high graphics right in your browser. According to sources at IGN, there are apparently going to be two currencies in Family Guy Online, Clams and Cash. So make sure you get enough of both! Unfortunately, not much else is known right now, but be sure to check back often as we will update you as soon as we know.
Right now, you can register to participate in the Closed Beta testing phase of Family Guy Online. If you pre-register now, you have the chance to be one of the first in the long line of people that will also be registering in order to try out the new browser game before anyone else.
Source: Game homepage