登録はそれぞれこちらから。
Unity - Unity Windows Phone 8 apps open beta
http://unity3d.com/beta/windowsphone8
Unity - Unity BlackBerry 10 Open Beta
http://unity3d.com/beta/blackberry10
関連情報
Unity Technologies Blog » Blog Archive » Unity 4 Beta program for Windows Phone 8 apps
http://blogs.unity3d.com/2013/03/27/unity-4-beta-program-for-windows-phone-apps/