The new episodes airs at Thursdays 10 PM on Comedy Central in the US. The first run will last 12 episodes, and the second one will contain the remaining 14 out of the 26 produced.
Further information can be found on Wikipedia: http://en.wikipedia.org/wiki/Futurama_%28season_6%29
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The first two episodes weren't really on par with my expectations. While the first one was certainly no masterpiece, it was okay, however I didn't really like the second episode. I thought they both felt a bit rushed, and I felt as though you were thrown directly back into the show, and everything was supposed to be back to normal. They started off with a pair of cracky "joke" episodes, while I believe I would have preferred a more story based introduction to the season. Granted, I didn't watch the second two movies, so that probably has part in why I felt this way. The first episode does tie in to the last movie, so those who have seen it might not feel like I do.
Anyway, with the first two episodes being pretty mediocre, I really liked the third one