We all know how bad Futurama has been treated by Fox, I've been doing a little research to bluntly shed some light on the current situation, although there isn't much light I'm afraid
Here are some facts and data regarding episode air dates and likely time slots ect, I know that most people know the situation but it's time that it was clearly put in writing for all to see and make the facts clear.
Here is what we have of Fox's so called "Season 4" at the moment:
01 3ACV19 12/09/01 Roswell that Ends Well
02 3ACV03 12/23/01 A Tale of Two Santas
03 3ACV18 01/06/02 Anthology of Interest II
04 4ACV03 02/10/02 Love & Rocket
05 4ACV02 02/17/02 Leela's Homeworld
06 3ACV10 03/03/02 Where the Buggalo Roam
07 3ACV17 03/10/02 A Pharaoh To Remember
on the 03/17/02 Godfellas should air
on 03/24/02 it's pre-empted by ID4

which leaves us with:
03/31/02 ?
04/07/02 ?
04/14/02 ?
04/21/02 ?
05/05/02 the season finale 4ACV11 "Where No Fan Has Gone Before"
this means that even if Futurama airs every week after 03/24/02 it will only get 13 episodes altogether this year

By the way things are looking we may only get 3 4ACV episodes this season because although there are four dates which could have Futurama aired, they might be used to air the 4 remaining Season 3 episodes which will still be left, it would make sense:
3ACV12: The Route of All Evil
3ACV16: A Leela of Her Own
3ACV21: Future Stock
3ACV22: The 30% Iron Chef
Judging by this it would mean that Fox would still have 15 episodes left unaired and if they showed them at the same rate they showed recent episodes we could be waiting until January 2004 to see that final 4ACV episodes