I don't have any more information. The book has been mentioned a few times on LW, but I don't know what stage it's at, and I haven't seen any of the text.
It is a selection of 345 articles, together over 2000 pages, mostly from the old Sequences from Overcoming Bias era, and a few long articles from Eliezer's homepage. The less imporant articles are removed, and the quantum physics part is heavily reduced.
(I have a draft because I am translating it to Slovak, but I am not allowed to share it. Maybe you could still volunteer as a proofreader, to get a copy.)
Previous Open Thread: http://lesswrong.com/r/discussion/lw/k9x/open_thread_may_26_june_1_2014/
(oops, we missed a day!)
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one.
3. Open Threads should start on Monday, and end on Sunday.
4. Open Threads should be posted in Discussion, and not Main.