"Pottermore and Google are teaming up to integrate Pottermore with a number of Google products and APIs. So when the series of Harry Potter ebooks launches on Pottermore.com in early October, these bestsellers will be available in the U.S. via the open Google eBooks platform. When you buy a Harry Potter ebook from Pottermore, you will be able to choose to keep it in your Google Books library in-the-cloud, as well as on other e-reading platforms."
Google eBooks can be read on most devices and Google Checkout will be the preferred third-party payment for all purchases on Pottermore.com.
Additionally, expect more videos to be put on YouTube similar to J.K. Rowling's big announcement on June 23.