I would like to be able to download and read purchased premium ebooks directly in the app instead of having to jump to another app to read published ebooks.
@Karsin And a second point: Our app is not a fully compliant epub 3 reader, and it will never be. There's no reason to re-invent the wheel on that, as there are plenty of apps which are great epub readers already out there or built into the OS of mobile devices.
Our app is really designed as a way to read the weekly streaming prepub releases on mobile, and not as a fully functional epub reader.
And I agree with Sam. There are great e-readers out there. If you have iOS devices, iBooks is pretty great for DRM free ebooks because it syncs highlights between devices and just has a slick interface for reading ebooks. I assume there are some great ones for Android too.