According to a recent tweet from WABetaInfo, the latest beta release for WhatsApp (v.2.18.39) hints at an upcoming feature which will allow users to add up to three participants to a group video/voice call. While the feature isn't currently live on the beta release, it is expected to be enabled with subsequent updates.
WhatsApp for Android previously added stickers and a WhatsApp store to the platform. Additionally, WABetaInfo adds that the last two beta update for the instant messenger featured a bug which prevented users from replying to individual messages from the notifications pane.