In the currently live version of WhatsApp on Android, the voice recording functionality is somewhat cumbersome and represents a fairly miserable user - experience. (redmondpie.com)
However you can spy on Whatsapp messages using methods described in the article. (myintimcity.com)
Features such as read receipts, typing indicator have been available in other messaging apps like WhatsApp for quite sometime, so nothing revolutionary about these changes. (iphonehacks.com)