It has been confirmed that BlackBerry 10's Android Runtime Layer will be updated into Jelly Bean with it currently on Gingerbread. If you're not familiar with this, BlackBerry Z10 owners are currently able to side-load Gingerbrea-based Android applications onto their device. This is certainly a huge thing for the platform as it's able to take advantage of Android's ecosystem.
While the news is only confirmed, there's no timetable as to when the update will be made available for the masses. Until then, stay tuned!
source: Crackberry
That makes bb10 a million times more appealing – in the future I may check it out on an upgrade cycle