Nokia Maps, the mapping solution from Nokia for Windows Phone devices is available for download from Windows Phone Marketplace in Nokia Lumia devices. There is no information on when this app will be made available on other Windows Phone devices. As you know Nokia Maps allows provided you the following,
Maps provides local walking, driving and public transport directions while highlighting cafes and local points of interests over 3G or Wi-Fi networks. Of course, there’s a social element to Maps allowing you to review and share your location as well. You can also pin your favourite places to the Windows Phone home screen for quick access in the future. Check the video for a quick rundown of Nokia’s Drive and Maps features.
Since the app is made available in beta form, I guess Nokia will release it to other Windows Phones when the app is completely made fixing bugs, etc,.
Source: The Verge