Sounds like they are still arguing about the pay for the actors, this could just be a scare tactic to show the actors they will replace them if they don't lower their demands.
Interesting that no-one (fixed below) criticized the actors for setting the bar too high, I'm not saying FOX aren't being dicks, but FOX is a business, if the pay is higher then the profit (huge simplification, I know) that they won't make the show at all.
I wonder why no fans are angry at the actors, like "If Billy West(Fry) really loved this show he should accept a pay cut" and are all "If FOX loved the show they would accept a profit margin cut". Just wondering.
EDIT: Upon a closer inspection of the comments I see this has been mentioned before, but still a minority to the "FUCK FOX" opinion.