Update: The HERE team has posted an official update on this stating: "we have noticed some discussions in the blogosphere about HERE on Windows Phone. We want to clarify that we are committed to providing great products and consumer experiences for Windows based phones. We will continue to support our HERE apps to ensure that they will be compatible with future versions of Windows."
Original story: It looks like Microsoft is taking over development of HERE Maps for Windows Phone from Nokia. The change comes after it was revealed that Nokia was looking to develop the client from the ground up for Android and iOS platforms.