It looks like Microsoft finally worked out the kinks in the app submission and certification process (read), and now "D3 Gear" is live for testers! The app is definitely rough, but functional. And there is lots more on the way, so watch for updates.
If you are a tester, please click HERE from your device to download.
If you want to become a tester for D3 Gear (and future Windows Phone apps), be sure to email email@example.com with the Microsoft account associated with your phone.