BlackBerry for Android leaks, but doesn't work
You can download it and install it if you want, but it won't do you any good. It seems that BlackBerry has the app locked down and is only allowing whitelisted BlackBerry IDs to login to the app. If you had a whitelisted BBID, you'd likely already have a beta version of the app, so there isn't much use of this APK. BlackBerry has commented on this, saying:
We can hope this leak means that we're close to a proper release, especially given that BlackBerry has said that the app was submitted to the iOS App Store weeks ago and is awaiting approval. Unfortunately, there are also rumors that the app will not be available to all upon release anyway. More word on that soon.