It's up to the publisher to do that, I know that there will be a kindle edition, but am not certain of any other formats. I imagine all of them will be DRM'd, sorry.
In the near future I will also have a performance chapter in a different book (written quite differently, and expecting more JS knowledge), but that title hasn't been announced yet. That text will have a DRM-free ebook for it, but you'll have to wait a lot longer.
Lastly I'll have learncanvas.com up at some point this summer, where I will begin posting a lot of canvas performance tips with live examples, among other things.
(The page count surprised me too. This is my first book, and it's been quite the overwhelming experience!)
Informit sells PDF, mobi and epub versions of all Pearson books. They print "From the library of Your Name" as a footer on every page but there's no additional copy protection as far as I know.
Thanks for sharing this link. For e-books I find PDF a superior format, as it maintains the original design and layout of the book best, while still having all the advantages of an e-book, searchable, etc. Appreciate that informit.com has that option.
I got a lot of technical books and they're a PITA to read and store as they are usually pretty big.
EDIT: Went back to the Amazon link and "Paperback: 700 pages", woah.