This is very new territory and the field is changing rapidly. Anne-Marie's title on Lynda.com is the only one I know of. It looks like you've watched it already.
As far as I know, you DO need to know about HTML to accomplish Fixed Layout EPUBs.
Here are some links that might be useful for you to get you started with fixed-layout ePubs:
How to Create Fixed-Layout iBooks by R. Scot Johns
Field Guide to Fixed Layout for E-Books a free ebook on the ins and outs of Fixed Layout EPUB (I found it only today so haven't read it yet)
ePubCrawler -- InDesign to Fixed Layout EPUB converter. (a tool for converting InDesign documents to fixed-layout ePub. It worked very well for me: I had to make only small adjustments to CSS styles).
Great resources, Kasyan. The best is the one you found yesterday, "Field Guide to Fixed Layout for E-Books". It's up-to-date and includes information about different EPUB/eBook readers. I've just bookmarked that source for the next time we get a query about Fixed Layout eBooks.
Our first support for EPUB3 Fixed Layout is now available with the 2014 (June 18th) update to Creative Cloud.
Download the trial and let us know how we can improve it.
Architect, InDesign Engineering
Moved to InDesign EPUB forum.