Windows 10 for phones is on the way, at least in preview form. Tonight, Microsoft began laying more groundwork for the Technical Preview by updating their Phone Insider app.
The major change to the app is the name to Windows Insider, matching the naming of the desktop program of the same name. Additionally, besides the previous domain account support there is now the ability to log in the Insider service using your Microsoft Account information.
Full story from the WindowsCentral blog...