At TGS, Sony has unveiled a new electronic book reading software for the PlayStation Vita, which you can see below. The user starts the application in the same manner as any other, and then shown is scrolling through a selection of books. Specifically, those are manga volumes. He settles on one from the Fate series, Fate Stay Night.
As you can see, navigation seems to be possible with both the buttons and the touchscreen. He can turn the pages quickly or slowly, which might remind one of Gravity Rush. Or a book. He is also seen zooming in and out by using the face buttons. In all, it seems a pretty handy ebook reader app.
More info on this will be reported as it becomes available.