BlackBerry 10 is currently stuck between a rock and a hard place when it comes to gaining traction. On one hand they need a large user base to attract developers but they have trouble convincing users to come to BlackBerry 10 due to the lack of app development. Personally I think BlackBerry could make some headway with this by simply making all Android apps installable over the air but sadly they refuse to do so.
We have just confirmed with Viber that they have decided to not release a version of Viber for BlackBerry 10. That is a shame since they confirmed multiple times in the past that they would be bringing it to BlackBerry 10 with OS 10.2. Even worse is the fact that Viber for Android runs decently on OS 10.2 so the did not even go the porting route… They confirmed that they have not shut the door on BlackBerry development but they are reassessing.
Either way their official statement is currently:
“…at this point, we unfortunately do not intend to release a version of Viber for BB10. If anything changes, we will keep you posted.”