If you are waiting for this rumored WhatsApp feature, the one with calls, this is a news for you! That’s right, this feature was promised for the end of 2014 but it didn’t show up but now, a few months late, here it is!
According some sources the option is presumably activated for each user, in an invite-like system where you have to get called by someone who already has it enabled.
For now, some users are reporting a hit-and-miss situation when trying to enable calling. You might have to grab the latest WhatsApp apk from the service’s website but this doesn’t guarantees that the feature will get activated for you.
So, with this, we can say that this calls feature is coming, but they don’t seem to be ready for the official announcement yet.