Screenshots of a Samsung Ativ S with Windows 10 Mobile Build 10070 show possible changes to the live tiles on the home screen. The tiles are much closer together than in earlier builds with very little space between the tiles.
The screenshots are from the Polish site Windows Mania. The build is, according to the site still very limited and shows both an icon of Internet Explorer and Project Spartan, the browser which is to be the default browser in Windows 10.
The tiles in the new layout are smaller and closer together. It seems very full with four rows together, but that may be due to scalability and this might be set to personal preference. To know for sure how build 10070 eventually will look like, we have to wait for the official release of Microsoft.