“By far the most authoritative on [Xiaomi], most thorough, most comprehensive book!” according to the Weibo communique. Handwritten preface by Lei Jun.
Additional information at the Xiaomi forum [Google Translate]. Someone needs to publish this in English ASAP.
Update, October 30, 2014: This book was written by Xiaomi co-founder Liwan Jiang. I have changed the post title to reflect that. Lei Jun did preface. not the entire book.