This is a member of the Viber Development Team.
Yes, Viber for Android is delayed more than expected, but as you know, technological developments tend to be delayed due to unexpected obstacles. We, as a company that cares about users’ experience, prefer releasing a fully-working product a little later than expected, rather than releasing it as early as possible, yet buggy and disappointing.
We will soon release the beta-version of Android to those who subscribed in time. The subscription is closed (full) by now.
If you have any other questions please feel free. That's why I'm here