It's officially confirmed that Stephen Hillenburg is coming back to the show in January: http://www.cartoonbrew.com/tv/spongebob-creator-stephen-hillenburg-returning-to-his-show-106935.html
I don't know if anyone knew about this yet, but FXX will also air a marathon of every Treehouse of Horror episode on October 26:
http://www.post-gazette.com/ae/tv-radio/2014/08/20/FXX-to-air-Every-Simpsons-Ever/stories/201408200011
They're supposed to air the tenth season (holy shit, season 10?) this year, and I'm sure that the show is still profitable for the network, so I don't think it's going to end anytime soon
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