This strikes me as the future, not only of genealogy information, but almost everything else in our daily lives. We now are seeing desktop, mobile, handheld, and web-based, or "cloud," applications all merge into one. Take your information with you wherever you are. You can have easy access to information that is important to you at any moment you want it.
You can read Duff Wilson's article about the new Ancestry App for Windows 8 at http://goo.gl/FBDFY.