The Windows 10 preview also introduces a slight change to how you personalize the home screen. The Cortana Tile can also be made into a huge square, and I can easily see that extra space being used to show more news headlines, or a blend of stories and notifications. I suppose eventually the larger Tiles will be able to pump more and different types of content to your home screen.
The People panel, for instance, can now become a huge square or a vertically orientated rectangle. In the Windows 10 preview, a small number of Live Tiles can be made larger than has previously been possible.