Yep, Family Guy is back. It went off the air 2-3 years ago but at least here in the States it found a cult following on the Cartoon Network. In the mean time Fox offered the creator of it a new deal and American Dad was born with a lot of similarities of Family Guy. Recently the Family Guy seasons were released on DVD and sold amazingly well so Fox brought it back for new shows.
I can't find a premiere date anywhere. I came across a few PR releases saying that the BBC picked up the rights to both the new Family Guy episodes and also to American Dad but no schedules are listed.