Just me again, saying I've updated the original post with the final group of contributors, which I'll mention here, too:
ETA: And now - here's the final list of contributors: Tim Pratt, Greg van Eekhout, Mur Lafferty, MK Hobson, Tina Connolly, Samantha Henderson, Alasdair Stuart, Amal El-Mohtar, Anna Schwind, Ann Leckie, Erin Cashier, Rachel Swirsky, David Steffen, and D.K. Thompson.
Yes, that's actually 14 stories. So it's going to be like a vampire's baker's dozen for October or something.
I'm really excited for you all to hear this whole thing. It's going to be like a grab-bag of candy for the month of October. Some of the stories are horror, some SF, some fantasy. Some fit Halloween and some are just plain fun, so in honor of Lucy and Linus I've decided to call the whole thing Tricks or Treats, because this bag of goodness has a lot of different flavors, and I think you're all going to really enjoy it.
More to come later!