Recently BlackBerry has announced BlackBerry 10 aka BB10 and yesterday they had announced BlackBerry 10 Dev Alpha C yesterday at BlackBerry Jam Europe show.
BlackBerry has gave another gift to its developers as BlackBerry will upgrade its Android Runtime for BB10 from Android 2.3 aka Gingerbread to newly Android Jelly Bean.
Android runtime allows developers to re-package Android apps so that they can be used in BlackBerry. So by updating Android Runtime developers can port more Android Apps to BlackBerry. However there is no time deadline when this runtime will be updates.