It's going to make the NT or NC that much more useful to owners. But as great as having this app will be, I have to wonder where its competition is. Instapaper and Pocket aren't listed, and neither is OverDrive or Wattpad.
And yes, those last 2 are competition. They're competition for your reading time, and that makes them competition for B&N's Nook Store. That's why I always assumed we'd never see them in the Nook App Store, but today's news could be a sign that either B&N changed their mind or I was wrong.
I'm hoping they changed their mind. One important way that tablets regularly beat dedicated ereaders is that they can more easily pull in content from multiple sources. That's one of the reasons I think tablets are often a better buy. If B&N really is planning to take that advantage away from tablets, good for them.