Here Maps will no longer be available on Windows 10 mobile phones. Starting from 30 June 2016 the mapping & navigation software from Nokia will be discontinued on Windows 10 mobile devices. If you happen to have updated here maps app on windowsphone 8.1 you would receive this message.
Thank me, hopefully it wont affect as I would still have WP8.1 since earlier Lumia Phones are not eligible for Windows 10 upgrade.