The new apps will feature better support for managing your notes and highlights, which could be a nice compliment tor textbooks and study guides. Readers can also use the quick bookmark function to quickly jump around in a book, back and forth between multiple spots (different parts of a history book, for example).
And last but not least the app now features a skim mode which should make it easier to flip through an ebook in much the same way that a reader might flip through a paper book while searching for the info they need.
Google Play Books is now available in 61 countries around the world, and supports apps on Android, iOS, and Chrome. it is, by my guess, one of the top 5 ebookstores in the world. I like to sum up the market as: Amazon, Apple, and the trailing three (Kobo, Google and B&N).