Image credit: Engadget

  • Arrow removed from the upper right corner of the home screen.
  • New start screen has more tile sizes, customizable live tiles. Live tiles have small, medium, and large size options. Scalable during the tile editing mode.Consistent experience between Windows 8 live tiles and Windows Phone 8 live tiles.
  • Nokia Map tech will be built into WP8. Offline maps, NAVTEQ data, Map control for developers, Turn-by-Turn voice navigation.
  • Multi-core processors (up to 64)
  • Displays up to WXVGA (1280 x 768),  3 screen resolutions now.  800×480,  1280×768, 1280×720
  • External storage on SD card
  • Same rendering in IE10 on WP8 and Windows 8. Should offer great browsing experience.
  • New, faster games and other demanding apps which, for the first time, can be written in native code. All this will run on a kernel shared with Windows 8 and Windows RT. Microsoft has managed to get one platform running on desktops, laptops, tablets and phones, the idea being that apps can be more easily ported from one to the next, promising killer games running on your phones.
  • There’s also a new wallet functionality thanks to the NFC support, but reliant on an augmented SIM, not hardware on the phone itself.  Microsoft Wallet hub saves credit cards, membership cards, integrates with 3rd party apps via API