Basically, they took Trident, refactored it and stripped out all the compatibility shims, and made it into EdgeHTML, which they will be working on making simila

Basically, they took Trident, refactored it and stripped out all the compatibility shims, and made it into EdgeHTML, which they will be working on making similar to WebKit/Blink/Gecko in terms of how it renders web pages. For pages that still need IE, you can switch to Trident, which will still be around.