So someone on tumblr read around official interviews and brought to light some gold.

http://wiki.puella-magi.net/Puella_Magi_Madoka_Magica_Official_Guidebook_%22You_Are_Not_Alone%22

UROBUCHI: In particular I did not prepare in advance any idea. I just said one after another what I came up right at that place. And when I did that, almost everything I said were accepted with "This is good." "Let's do that." Then I got worried as I thought "Oh no. I will have to turn everything I've just said into plot lines myself." (LOL)

How many times did you repeat this kind of discussion?

KUBOTA: No, only once at the very beginning. Urobuchi-san summarized everything into a composition proposal before our next chance to meet.

UROBUCHI: I came up with a rough structure of around 3 stages: I will show the beginning of the story like this; and next these details of the truth will be revealed; and last that truth will be revealed. And then I divided them further and made it into a composition proposal for one cour. However at that stage, the flow from ep. 6 to around ep. 8 was still a bit tricky. When I look back from now, ep. 9 was really bad!

AOKI: That's right. [You were saying] "I am going to put Sayaka decisively into despair." (LOL)

UROBUCHI: The idea that I came up with anyways was to bully Sayaka (LOL). At that moment, the thinking for Sayaka falling into despair was that it was not due to Hitomi. For that, it was a part that got inserted at the stage when the screenplay was written.
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I always thought that Hitomi's feelings for Kamijou came out of nowhere. Now we see the truth.
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Q: How did you decide the title of the anime?

UROBUCHI: At the beginning, I just put the temporary title myself. I think it was "Mahou Shoujo Apocalpyse Madoka Magica" for sure.

IWAKAMI: The name "Madoka Magica" stayed as the temporary title for some time, and as an unofficial name it stayed as the project made its progress. When 2010 came, we had the discussion about its official title.

UROBUCHI: And by then everyone was so used to the temporary title that (the discussion) came down to "Let's keep it like this." But there was also "obviously the Apocalypse got to go." (LOL) Come to think of it, there was also the idea of not having "Mahou Shoujo" and only go with "Madoka Magica."

SHINBO: But for me, I believe in the title the words "Mahou Shoujo" is absolutely necessary. To the extent that if it is not there, there is no meaning (for me) to do (the anime). On that I did not budge.

THE SCREENPLAY WAS ALMOST THE SAME AS THE FIRST DRAFT

Q: How long did the writing of the screenplay take?

UROBUCHI: It went from the end of 2008 to the end of 2009. Since there were other works going in parallel in that period, I went full gear and came up with one episode every month. And I did not talk anything about what would happen later, just saying things like "Just wait for the next issue!". (LOL)

IWAKAMI: It's just that even though the screenplay was being done, there was not much chance to discuss it. As at the stage of the first draft, it was already interesting.

SHINBO: There was almost nothing that I would want to ask for changes.

How about using actual dialogues in the episode subtitles?

UROBUCHI: That was because we were lazy (LOL)

AOKI: What! Is that so? (LOL)

UROBUCHI: I thought I would just put it there anyway first and then later I would give it more thought.... But it just stayed as it is.
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Beautiful... Just beautiful.

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CHARACTERS IN "MADOKA MAGICA" ARE SIMILAR TO CHARACTERS IN "HIDAMARI"?

UROBUCHI: Before I saw the original character design by Aoki-san, the character image I had in my head was that of "Hidamari." I imagined by making replacements like Madoka becoming Yuno, Mami becoming Hiro-san... And so every time a character design is done I was relieved, thinking "Good, it is becoming an anime different from 'Hidamari!" (LOL)

And from this source.

UG - After I finished writing Madoka screenplay, I watched Heartcatch PreCure and then I just buried my head with my arms... lol.. saying to myself "My heart is so damned soiled..."

Interviewer - You mean if you had watched Heartcatch before you wrote the screenplay the story could have been different?

UG - Perhaps the screenplay could have had a little bit more of flowers of heart (lol) There would not have been that self-hatred I had then. "I should have done it this way, but... I, I...!!!" kind of feeling (lol)

And the best part, from this interview.

Q: Madoka seems to be inspired by Goethe's Faust and in Psycho-Pass you quoted
works from Max Weber and other German writers. How did you discover them and how did they inspire you?

A: The designers from SHAFT thought of inserting the quotes from Faust. I only noticed them when people approached me asking about them. My main inspirations are eroge and classical literature.
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There are no words, just feelings. XD