For example, you can now manually insert page breaks into an ebook by using Pages’s break tools, rather than having to use the template’s “Chapter Heading” template to do so.
But that’s not all: The Pages 5.2 update last week actually mentioned “improved ePub export” in its release notes, and added a few more fixes. That’s right: Not only did someone take the time to improve ePub export for Pages 5.0, but they seem to actively be working on making it better with future releases.
You (mostly) don’t need Apple’s four-year-old ebook template: Because the export recognizes page breaks and section breaks, you can use those along with custom text styles to create your ebook table of contents—you don’t have to download Apple’s template. That said, Pages takes a shortcut here with its text styling; if you look at the code of your resulting export, all text styles come out as various CSS classes for the paragraph tag.
As much as I love iBooks Author and the awesomeness of multi-touch ebooks, the ability to create a document that is "ePub 3" compliant, allows a wider audience beyond those possessing only iPad or Mavericks OS.