I'm on board with anything involving what is essentially a joke telling Dalek.
Had they stopped doing them week-to-week at some point?
No, but in the other runs they've always had a writers retreat and a bit of lead time to think of some ideas. Because Matt and Trey had been in New York working on Book of Mormon they didn't have that this year. There was, I think, maybe twelve days from when they left NYC to when production started. There's a great interview with them in, I think, New York magazine explaining the whole thing.
I love the spontaneity the show has, but Jesus you'd think they'd want to give themselves more time, especially after finishing the musical.
I was actually surprised they didn't get an Osama episode out. The did the Elian Gonzalez episode in a day, didn't they? And I believe they've done one or two others in a day.
They killed Bin Laden in the Jersey Shore episode last year. After Snooki got all that smoosh smoosh.