You can always go to this part of the Cartoon Network site to see what the next 20 episodes scheduled are:
http://schedule.cartoonnetwork.com/servlet/ScheduleServlet?action=viewAll&showID=324815&show=Futurama
It appears that to see any beyond 20, you need to go this page and select the schedule for each individual day:
http://schedule.cartoonnetwork.com/servlet/ScheduleServlet?action=selectDay
There's one more on CN's schedule not listed previously in this thread:
March 2nd 2003 [3ACV03] 'Luck of the Fryrish'
They are airing in production order, so you can go here and follow the production codes to easily predict the remainder of the schedule:
http://www.epguides.com/futurama/
Although, assuming Cartoon Network cannot air episodes from the current season yet, that system will break on episode 3ACV12, which was held over for season 5, and episode 4ACV11, which was aired as the season finale of season 4.
After February, it will take just under another 4 weeks to show the remaining episodes from seasons 1 through 4, at which point I assume CN will restart from the beginning. If they do start showing the current season, it will take less than 3 more weeks to complete the series. With 72 episodes in the full run, it would take 14 weeks and 2 days to cycle through the full series at the current rate of airing.