Got Volume 7 just today. Here's some information from the commentaries and collections thanks to Peelified.
Calculon will have a one man show next season.
Floyd Farnsworth and Ben may appear if more episodes get ordered.
Mars was fixed with rocket boosters (probably by the Wongs), but it was cut for time.
Most season 7A scripts ran 20 to 30 pages longer than T.V. time allows for, so tons of good stuff got cut from every show.
Bender will again brush his ass with Fry's toothbrush.. but instead Fry actually notices. Leading to something wacky.
"Leela and the Genestalk" will reveal why Munda had arms in season 2 and tenticles in season 4.
Also if you enjoyed Zoidberg's dumpster scenes in 7ACV12, then you'll love 7ACV25.. the dumpster sounds pivotal in some way.
Calculon's grave was taken out of a shot in 7ACV07 b/c of an contitunity issue with his grave in "Calculon 2.0" so the name on the stone was changed to Roomba.
Crave online quotes from interview with David X. Cohen:
David X. Cohen: The fing-longer is coming back. You will be ecstatic to hear, again summer 2013, we have an episode called “The Inhuman Torch” where Bender becomes a heroic fire fighter. The professor will be using his fing-longer, which originally if you remember, it was just a crazy dream the professor had that someday he would create this invention, the fing-longer. But it exists now and it will be back next summer in real life. By real life I mean in the cartoon “Futurama.”
Saturday Morning Fun Pit: The third one is a military themed show. I’m just going to tell you the names of the three things. That will probably give it to you right there. The first one’s called “Bendy-Boo and the Mystery Crew.” The second one is called “Purpleberry Pond” and the third one is called “G.I. Zap.” So there you go. That title is worth 1000 words.
David X. Cohen: Next year is a strong crop of episodes. Speaking of technology I should say, we have an episode written by one of our science background writers, Ken Keeler, that is inspired by 3D printing technology. We had a 3D printer around the office for this whole year and we were printing little plastic gizmos. It was running basically all the time producing this crowd of toxic plastic smoke so if anyone asks where we get our ideas now I say from the toxic plastic fog.
It actually was consuming so much of our time that Ken Keeler went and wrote an episode about it so there is another new technology inspiring an episode. We’ve got a big, epic, huge Fry and Leila episode that I mentioned that spans many years and much romance and a lot of crazy sci-fi stuff too that’s number 26.