We still don't have a date for the relaunch. You might recall that an unreleased version of BBM for Android hit the Google Play Store (along with a large number of fakes) and 1.1 million people loaded it onto their phones. At the same time, BBM for iOS was getting pushed out regionally. When the unreleased Android flavored version of BBM screwed things up and prevented a valid launch, BlackBerry wisely took all of its marbles and went home.
Hopefully we won't get a repeat of the problems that made rolling out BBM for iOS and BBM for Android so problematic for BlackBerry. Now that the Android version is in beta, we shouldn't be too far away from another try at a launch.