http://venturebeat.com/2015/03/02/microsoft-exec-android-is-vulnerable-and-windows-10-will-help-us-steal-its-users/
Emerging markets usually don't get flagships, but MS wants to wait to reveal any new Win10-compatible....compatible...phones till later in the year.
Universal apps IMHO will be the kicker for Windows 10 (Phone) to succeed. Write once, distribute to many