Tor are publishing "Equoid" on their website today; after 9am EDT (2pm, BST) you can find Equoid here.
(And if that doesn't sate your appetite you can pre-order the $1.99 ebook edition here (in the US) (or the UK Kindle store has it here), or pre-order the Subterranean Press signed limited edition hardcover here (note publication date: for contractual reasons there's a 12 month wait).
Yes, I will answer questions about "Equoid" in the comments below. So, HERE BE SPOILERS.
Meanwhile, if you are jonesing for more Evil Unicorns, I think you may enjoy this video ...