BlackBerry has released an update for BBM in the Beta Zone adding to the stickers, the first beta build contained free stickers, this one contains paid sticker packs that you could actually purchase. Sponsored content also got touched up in this build, new core functions were added to this build of BBM as well.
While this is a limited beta only those of you all who have been invited to test this version of BBM will be eligible to download this certain build.
To check if you have an update open up your BlackBerry Beta Zone app.