In what is seen as a step forward for the new Edge rendering engine, Microsoft has revealed it was included in the Windows 10 Technical Preview for phones, which was released earlier this week
Program Manager for Internet Explorer, Kyle Pflug, said in a blog post that they are "excited to bring this new rendering engine to phones for the first time with the Windows 10 Technical Preview for phones." The new rendering engine is hosted within Internet Explorer in this build, however, a new browser, known as "Project Spartan", will replace Internet Explorer in future previews.
As a fork of Trident, the current rendering engine found in Internet Explorer, Edge is Microsoft's way to break free from the legacy support that constantly slows down IE. Edge is also the core of Spartan, the new browser coming with Windows 10.