Kodi is the new name for XBMC media center. "Leia" is the codename for version 18 of Kodi.
XBOX One Support with Microsoft
Improvements to the main video player with simpler maintenance, more portable and efficient code, support for a DRM-protected stream (for example, Widevine), and possibly future support for PiP, headless mode and transcoder mode
RetroPlayer Retro Gaming Emulator is now part of Kodi
Redesigned input processing using controller add-ins
Best Blu-ray support
The official Kodi version does not contain any content what so ever. This means that you should provide your own content from a local or remote storage location, DVD, Blu-Ray or any other media carrier that you own. Additionally, Kodi allows you to install third-party plugins that may provide access to content that is freely available on the official content provider website. The watching or listening to illegal or pirated content which would otherwise need to be paid for is not endorsed or approved.
There are some issues with Skins.
Fuse(Neue) looks great but when it first opens the menu is distorted and its menus have no ‘back/home’ button- so force closing the app is all to do
Xperience1080 and Amber menus have no ‘back/home’ button- so force closing the app is all to do