Brandon Sanderson got an invitation from John Joseph Adams to participate in an anthology of stories about power armor. He asked me if I wanted to write such a story and, of course, I said yes (while doing a little dance). Brandon replied to Mr. Adams that he’d be happy to participate in the anthology if he could do so with a co-author. Mr. Adams said that would be fine and off we went.
I brainstormed, outlined and finally finished the story on 30 April 2011 (deadline May 15th) and sent it to Brandon for editing while he was at Penguicon 2011. Then I spent the next several days agonizing over what Brandon would think of it. My agony was only exacerbated by the fact that I had exceeded the wordcount specified by Mr. Adams (7500) by 1100 words and was unable to chop the story further. Incidentally, that 8600 wordcount turned the story into a novelette.
26 July 2011: Mr. Adams officially accepted the story some time ago and has announced the sale of the anthology, entitled ‘Armored,’ to BAEN on his webpage.
And here’s a link to an article io9 did on the anthology.