There were rumours of a return recently...
Apparently Futurama and Family Guy were given some late night slot as filler in the US, but they ended up trouncing everything in the ratings

Rumours then started that they were going to order new episodes of both, not sure what ever happened though...

Edit: Wired article here
Important Quote here:
"Last year, Futurama and Family Guy reruns did so well that it's likely both shows (which Fox killed in prime time) will produce new episodes."
( elusive I'm not really here. You're imagining me, Wed 25 Aug 2004, 19:51, archived)

They're definitely making more Family Guy
wouldn't be surprised if Futurama cam back too.
( wayward., Wed 25 Aug 2004, 19:57, archived)

american dad
from the makers of family guy - the pilot looks awesome! :)
( Delete Me, Wed 25 Aug 2004, 20:03, archived)

There's that
But they're making more actual Family Guy too. And a movie.
( wayward., Wed 25 Aug 2004, 20:07, archived)